diff --git a/src/App.vue b/src/App.vue
index 89e5f94..45a4c8e 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -21,7 +21,9 @@ export default defineComponent({
     const box = this.$refs.box as MeshPublicInterface
     if (renderer && box) {
       renderer.onBeforeRender(() => {
-        box.mesh.rotation.x += 0.01
+        if (box.mesh){
+          box.mesh.rotation.x += 0.01
+        }
       })
     }
   },