diff --git a/packages/studio/src/App.tsx b/packages/studio/src/App.tsx
index 1d49671fa..fff17410e 100644
--- a/packages/studio/src/App.tsx
+++ b/packages/studio/src/App.tsx
@@ -261,6 +261,7 @@ export function StudioApp() {
   const { syncPreviewTimelineHotkey, syncPreviewHistoryHotkey } = appHotkeys;
   const handlePreviewIframeRef = useCallback(
     (iframe: HTMLIFrameElement | null) => {
+      if (previewIframeRef.current === iframe) return;
       previewIframeRef.current = iframe;
       setPreviewIframe(iframe);
       syncPreviewTimelineHotkey(iframe);
diff --git a/packages/studio/src/components/nle/NLELayout.tsx b/packages/studio/src/components/nle/NLELayout.tsx
index a452de73c..1c3902474 100644
--- a/packages/studio/src/components/nle/NLELayout.tsx
+++ b/packages/studio/src/components/nle/NLELayout.tsx
@@ -234,9 +234,11 @@ export const NLELayout = memo(function NLELayout({
   const currentLevel = compositionStack[compositionStack.length - 1];
   const directUrl = compositionStack.length > 1 ? currentLevel.previewUrl : undefined;
 
+  const onIframeRefRef = useRef(onIframeRef);
+  onIframeRefRef.current = onIframeRef;
   useEffect(() => {
-    onIframeRef?.(iframeRef.current);
-  }, [compositionStack.length, onIframeRef, refreshKey, iframeRef]);
+    onIframeRefRef.current?.(iframeRef.current);
+  }, [compositionStack.length, refreshKey, iframeRef]);
 
   // Save master seek position before drilling down so we can restore it on back-navigation.
   // saveSeekPosition() sets pendingSeekRef in useTimelinePlayer which onIframeLoad reads.