Error thrown when you set state

[qwaiks]

@lukepighetti just added your implementation on flutter hotspot to an app im building, pretty cool but it throws this error anytime setstate is updated but the hotspot has already been completed and dismissed. been ticking around to see if i can fix it but cant seem solve it

Reloaded 1 of 3333 libraries in 1,016ms.
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following RangeError was thrown building HotspotProvider(dirty, state:
HotspotProviderState#4ca29):
RangeError (index): Invalid value: Only valid value is 0: 2

The relevant error-causing widget was:
  HotspotProvider
  HotspotProvider:.../lib/app.dart:115:28

When the exception was thrown, this was the stack:
#0      List.[] (dart:core-patch/growable_array.dart:264:36)
#1      HotspotProviderState.build (package:hotspot/src/hotspot_provider.dart:245:67)
#2      StatefulElement.build (package:flutter/src/widgets/framework.dart:5409:27)
#3      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5297:15)
#4      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#5      Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#6      StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#7      Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#8      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#9      Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#10     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#11     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#12     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#13     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#14     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#15     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#16     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#17     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#18     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#19     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#20     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#21     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#22     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#23     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#24     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#25     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#26     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#27     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#28     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#29     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#30     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#31     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#32     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#33     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#34     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#35     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#36     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#37     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#38     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#39     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#40     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#41     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#42     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#43     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#44     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#45     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#46     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#47     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#48     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#49     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#50     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#51     StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#52     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#53     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#54     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#55     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#56     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#57     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#58     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#59     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#60     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#61     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#62     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#63     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#64     StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#65     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#66     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#67     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#68     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#69     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#70     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#71     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#72     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#73     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#74     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#75     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#76     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#77     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#78     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#79     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#80     StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#81     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#82     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#83     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#84     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#85     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#86     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#87     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#88     ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#89     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#90     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6441:14)
#91     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#92     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#93     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#94     Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#95     StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#96     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#97     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6441:14)
#98     Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#99     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#100    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#101    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#102    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#103    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#104    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#105    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#106    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#107    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#108    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#109    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#110    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#111    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#112    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#113    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#114    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#115    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#116    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#117    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#118    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#119    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#120    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#121    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#122    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#123    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6441:14)
#124    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#125    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#126    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#127    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#128    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#129    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#130    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#131    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#132    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#133    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#134    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#135    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#136    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#137    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#138    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#139    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#140    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#141    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#142    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#143    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#144    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#145    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#146    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#147    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#148    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#149    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6441:14)
#150    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#151    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#152    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#153    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#154    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#155    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#156    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#157    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#158    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#159    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#160    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#161    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#162    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#163    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#164    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#165    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#166    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#167    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#168    StatelessElement.update (package:flutter/src/widgets/framework.dart:5373:5)
#169    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#170    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6441:14)
#171    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#172    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#173    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#174    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#175    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#176    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#177    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#178    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#179    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#180    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#181    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#182    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#183    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#184    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#185    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#186    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#187    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#188    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#189    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#190    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#191    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#192    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#193    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#194    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#195    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#196    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#197    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#198    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#199    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#200    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#201    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#202    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#203    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#204    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#205    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#206    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#207    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#208    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#209    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#210    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#211    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#212    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#213    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#214    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#215    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#216    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#217    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#218    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#219    SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6441:14)
#220    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#221    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#222    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#223    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#224    _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#225    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#226    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#227    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#228    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#229    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#230    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#231    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#232    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#233    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#234    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#235    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#236    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#237    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#238    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#239    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#240    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#241    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#242    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#243    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#244    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#245    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#246    ProxyElement.update (package:flutter/src/widgets/framework.dart:5628:5)
#247    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#248    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#249    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#250    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#251    StatefulElement.update (package:flutter/src/widgets/framework.dart:5485:5)
#252    Element.updateChild (package:flutter/src/widgets/framework.dart:3685:15)
#253    ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5322:16)
#254    StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5462:11)
#255    Element.rebuild (package:flutter/src/widgets/framework.dart:5016:7)
#256    BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2779:19)
#257    WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:916:21)
#258    RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:360:5)
#259    SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1297:15)
#260    SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1227:9)
#261    SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:952:7)
#265    _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)
(elided 3 frames from class _Timer and dart:async-patch)

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D/EGL_emulation( 8136): app_time_stats: avg=7746.76ms min=0.89ms max=92872.28ms count=12

[lukepighetti]

Hey! Quick triage says I cannot reproduce. Can you provide a MCVE?

[iqfareez]

I also experienced the same issue. It happens when I call setState after the Hotspot flow is completed

════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown building PaintBoundsBuilder(state: _PaintBoundsBuilderState#48c68):
This widget has been unmounted, so the State no longer has a context (and should be considered defunct).
Consider canceling any active work during "dispose" or using the "mounted" getter to determine if the State is still active.

The relevant error-causing widget was:
    PaintBoundsBuilder PaintBoundsBuilder:file:///C:/Users/Iqmal/AppData/Local/Pub/Cache/hosted/pub.dev/hotspot-0.1.3/lib/src/hotspot_provider.dart:291:30

When the exception was thrown, this was the stack:
#0      State.context.<anonymous closure> (package:flutter/src/widgets/framework.dart:952:9)
framework.dart:952
#1      State.context (package:flutter/src/widgets/framework.dart:958:6)
framework.dart:958
#2      HotspotTargetState.globalPaintBounds (package:hotspot/src/hotspot_target.dart:118:8)
hotspot_target.dart:118
#3      HotspotProviderState.build.<anonymous closure>.<anonymous closure> (package:hotspot/src/hotspot_provider.dart:297:57)
hotspot_provider.dart:297
#4      _PaintBoundsBuilderState.build (package:hotspot/src/paint_bounds_builder.dart:33:26)
paint_bounds_builder.dart:33
#5      StatefulElement.build (package:flutter/src/widgets/framework.dart:5743:27)
framework.dart:5743
#6      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5631:15)
framework.dart:5631
#7      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5794:11)
---- truncated
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[lukepighetti]

would appreciate some help tracking this down. ty!