diff --git a/inc/CalDAVRequest.php b/inc/CalDAVRequest.php
index 2e129afe..ae11158a 100644
--- a/inc/CalDAVRequest.php
+++ b/inc/CalDAVRequest.php
@@ -312,6 +312,7 @@ class CalDAVRequest
       }
       return $existing_lock;
     }
+    return false;
   }