diff --git a/src/extensions/core/widgetInputs.ts b/src/extensions/core/widgetInputs.ts
index b998dd46b..ee6dab683 100644
--- a/src/extensions/core/widgetInputs.ts
+++ b/src/extensions/core/widgetInputs.ts
@@ -506,8 +506,7 @@ export function mergeIfValid(
     }
   }
 
-  // @ts-expect-error fixme ts strict error
-  return { customConfig: customSpec[1] }
+  return { customConfig: customSpec?.[1] ?? {} }
 }
 
 app.registerExtension({