fix a runtime error

Author: MrWangJustToDo

packages/react/src/components/DiffView.tsx

@@ -319,7 +319,7 @@ const DiffViewWithRef = <T extends unknown>(
     }
   }, [diffFile, _diffFile]);
 
-  useUnmount(() => diffFile._destroy(), [diffFile]);
+  useUnmount(() => diffFile?._destroy?.(), [diffFile]);
 
   useImperativeHandle(ref, () => ({ getDiffFileInstance: () => diffFile }), [diffFile]);
 

packages/vue/src/components/DiffView.tsx

@@ -187,7 +187,7 @@ export const DiffView = defineComponent<
 
     useProvide(props, "extendData", extendDataSymbol, { deepWatch: true });
 
-    onUnmounted(() => diffFile.value._destroy?.());
+    onUnmounted(() => diffFile.value?._destroy?.());
 
     options.expose({ getDiffFileInstance: () => diffFile.value });