Fix syncMesToSwipe checks Ported from #3634

ca14352972664d396d764755fad1fd7fb68a968b

Cohee <18619528+Cohee1207@users.noreply.github.com>

public/script.js+5 -1 Viewed

+    }
     const targetMessageId = messageId ?? chat.length - 1;
-    if (chat.length > targetMessageId || targetMessageId < 0) {
+    if (targetMessageId >= chat.length || targetMessageId < 0) {
         console.warn(`[syncMesToSwipe] Invalid message ID: ${messageId}`);
         return false;
+    }
     const targetMessage = chat[targetMessageId];
+    if (!targetMessage) {
+        return false;
+    }
     // No swipe data there yet, exit out
     if (typeof targetMessage.swipe_id !== 'number') {
         return false;