diff --git a/src/danog/MadelineProto/TL/TL.php b/src/danog/MadelineProto/TL/TL.php
index ee3c2a79..7e4979df 100644
--- a/src/danog/MadelineProto/TL/TL.php
+++ b/src/danog/MadelineProto/TL/TL.php
@@ -140,7 +140,9 @@ class TL
 
                 return $concat;
                 break;
+
             default:
+                throw new Exception("Couldn't serialize param with type ".$type_);
                 break;
         }
     }