From 5ef753bfa830296a3f1ad0c711719b582c9b3259 Mon Sep 17 00:00:00 2001
From: hannahhoward <hannah@hannahhoward.net>
Date: Fri, 4 Sep 2020 10:04:50 -0700
Subject: [PATCH] fix(markets): check for nil tipset

check for nil tipset when check func is called to avoid panic
---
 markets/storageadapter/client.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/markets/storageadapter/client.go b/markets/storageadapter/client.go
index 91fc6a054dd..1d41ecf9192 100644
--- a/markets/storageadapter/client.go
+++ b/markets/storageadapter/client.go
@@ -351,6 +351,11 @@ func (c *ClientNodeAdapter) OnDealExpiredOrSlashed(ctx context.Context, dealID a
 
 	// Called immediately to check if the deal has already expired or been slashed
 	checkFunc := func(ts *types.TipSet) (done bool, more bool, err error) {
+		if ts == nil {
+			// keep listening for events
+			return false, true, nil
+		}
+
 		// Check if the deal has already expired
 		if sd.Proposal.EndEpoch <= ts.Height() {
 			onDealExpired(nil)