diff --git a/src/widgets/RRule.tsx b/src/widgets/RRule.tsx
index 0c0374d..acdc41e 100644
--- a/src/widgets/RRule.tsx
+++ b/src/widgets/RRule.tsx
@@ -103,7 +103,7 @@ function sanitizeByDay(item: string | string[] | undefined) {
       return value;
     });
   } else {
-    return ret;
+    return [];
   }
 }