diff --git a/models/cards.js b/models/cards.js
index fd4913723..3944b09f6 100644
--- a/models/cards.js
+++ b/models/cards.js
@@ -1202,6 +1202,8 @@ Cards.mutations({
           assignees: assigneeId,
         },
       };
+    } else {
+      return false;
     }
   },