diff --git a/lib/handlers/on-move.js b/lib/handlers/on-move.js
index 4cc1803f..e341a7bb 100644
--- a/lib/handlers/on-move.js
+++ b/lib/handlers/on-move.js
@@ -20,7 +20,7 @@ module.exports = (server, messageHandler) => (mailbox, update, session, callback
         }
 
         if (!lock.success) {
-            return callback(null, new Error('Failed to get folder write lock'));
+            return callback(new Error('Failed to get folder write lock'));
         }
 
         messageHandler.move(