diff --git a/src/mixin/multi-window.ts b/src/mixin/multi-window.ts
index f88b604..5c62630 100644
--- a/src/mixin/multi-window.ts
+++ b/src/mixin/multi-window.ts
@@ -74,7 +74,7 @@ export class MultiWindow extends Vue {
   }
 
   windowBack (argument?: any): void {
-    const context = window.opener.$vue
+    const context = window?.opener?.$vue
     const callback = this.$data.$multiWindowOptions.callback
     const delayClosingWindow = this.$data.$multiWindowOptions.delayClosingWindow
     if (!context) {