diff --git a/Source/gui/SNTBinaryMessageWindowView.swift b/Source/gui/SNTBinaryMessageWindowView.swift
index abfecc38..7800e83f 100644
--- a/Source/gui/SNTBinaryMessageWindowView.swift
+++ b/Source/gui/SNTBinaryMessageWindowView.swift
@@ -288,7 +288,7 @@ struct SNTBinaryMessageWindowView: View {
         }
 
         HStack(spacing: 15.0) {
-          if c.eventDetailURL.count > 0
+          if c.eventDetailURL?.count ?? 0 > 0
             && !(event?.needsBundleHash ?? false && !bundleProgress.isFinished)
           {
             OpenEventButton(customText: c.eventDetailText, action: openButton)