diff --git a/lib/shared/message-utils.js b/lib/shared/message-utils.js
--- a/lib/shared/message-utils.js
+++ b/lib/shared/message-utils.js
@@ -726,7 +726,7 @@
 
   const threadID = threadInfo.id;
   const messageIDs = useSelector(
-    state => state.messageStore.threads[threadID].messageIDs,
+    state => state.messageStore.threads[threadID]?.messageIDs,
   );
 
   return React.useCallback(async () => {