From 5902ddaf062e4c1c5f173267799ec26483772a30 Mon Sep 17 00:00:00 2001
From: Michael Telatynski <7t3chguy@gmail.com>
Date: Thu, 10 Mar 2022 13:34:24 +0000
Subject: [PATCH] Fix issues with ThreadSummary in msc-enabled mode (#8018)

---
 src/components/views/rooms/ThreadSummary.tsx | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/components/views/rooms/ThreadSummary.tsx b/src/components/views/rooms/ThreadSummary.tsx
index 2a5865fddc..22c30dacda 100644
--- a/src/components/views/rooms/ThreadSummary.tsx
+++ b/src/components/views/rooms/ThreadSummary.tsx
@@ -68,11 +68,13 @@ const ThreadSummary = ({ mxEvent, thread }: IProps) => {
 
 export const ThreadMessagePreview = ({ thread }: Pick<IProps, "thread">) => {
     const cli = useContext(MatrixClientContext);
-    const lastReply = useTypedEventEmitterState(thread, ThreadEvent.Update, () => thread.lastReply());
+    const lastReply = useTypedEventEmitterState(thread, ThreadEvent.Update, () => thread.replyToEvent);
     const preview = useAsyncMemo(async () => {
+        if (!lastReply) return;
         await cli.decryptEventIfNeeded(lastReply);
         return MessagePreviewStore.instance.generatePreviewForEvent(lastReply);
     }, [lastReply]);
+    if (!preview) return null;
 
     const sender = thread.roomState.getSentinelMember(lastReply.getSender());
     return <>
@@ -83,13 +85,11 @@ export const ThreadMessagePreview = ({ thread }: Pick<IProps, "thread">) => {
             height={24}
             className="mx_ThreadInfo_avatar"
         />
-        { preview && (
-            <div className="mx_ThreadInfo_content">
-                <span className="mx_ThreadInfo_message-preview">
-                    { preview }
-                </span>
-            </div>
-        ) }
+        <div className="mx_ThreadInfo_content">
+            <span className="mx_ThreadInfo_message-preview">
+                { preview }
+            </span>
+        </div>
     </>;
 };