diff --git a/docs/src/demos/Examples/CollaborativeEditing/index.vue b/docs/src/demos/Examples/CollaborativeEditing/index.vue
index 7dae33a26..a857d84e7 100644
--- a/docs/src/demos/Examples/CollaborativeEditing/index.vue
+++ b/docs/src/demos/Examples/CollaborativeEditing/index.vue
@@ -109,7 +109,7 @@ export default {
 
   methods: {
     setName() {
-      const name = window.prompt('Name')
+      const name = (window.prompt('Name') || '')
         .trim()
         .substring(0, 32)