diff --git a/framework/core/js/src/common/ExportRegistry.ts b/framework/core/js/src/common/ExportRegistry.ts
index 6317061d9..3cbe5fcdf 100644
--- a/framework/core/js/src/common/ExportRegistry.ts
+++ b/framework/core/js/src/common/ExportRegistry.ts
@@ -93,7 +93,7 @@ export default class ExportRegistry implements IExportRegistry, IChunkRegistry {
   private _revisions: any = null;
   private _webpack_runtimes: any = {
     // @ts-ignore
-    core: __webpack_require__,
+    core: window.testing ? null : __webpack_require__,
   };
 
   add(namespace: string, id: string, object: any): void {