fix: 1

src/sdk/association/animation.ts

@@ -133,7 +133,7 @@ export const addFrame = (
 
   const stopAttrib = mergeFuns(() =>
     watchEffect(() => amMap[key].frames[data.id]?.changeTime(data.time)),
-    watchEffect(() => amMap[key].frames[data.id]?.setMat(data.mat))
+    watchEffect(() => data.mat && amMap[key].frames[data.id]?.setMat(data.mat))
   );
 
   const stopWatch = watch(