diff --git a/pb_schema.json b/pb_schema.json
index 05e01ce..92db876 100644
--- a/pb_schema.json
+++ b/pb_schema.json
@@ -405,8 +405,8 @@
               }
           }
       ],
-      "listRule": null,
-      "viewRule": null,
+      "listRule": "",
+      "viewRule": "",
       "createRule": null,
       "updateRule": null,
       "deleteRule": null,