diff --git a/src/cli/server.ts b/src/cli/server.ts
index e6e94cae5c..0299bc1c32 100644
--- a/src/cli/server.ts
+++ b/src/cli/server.ts
@@ -127,6 +127,10 @@ class MockBrowserWindow {
       });
     },
   };
+
+  isDestroyed(): boolean {
+    return false;
+  }
 }
 
 const app = express();