diff --git a/check.sh b/check.sh
index 432bbfd..911cb67 100755
--- a/check.sh
+++ b/check.sh
@@ -1,5 +1,8 @@
 #!/bin/sh
 
+set -ex
+
+
 echo Checking and formatting with black...
 black .
 
diff --git a/tg/controllers.py b/tg/controllers.py
index 7ca446b..30e7b78 100644
--- a/tg/controllers.py
+++ b/tg/controllers.py
@@ -9,6 +9,7 @@ from tempfile import NamedTemporaryFile
 from typing import Any, Callable, Dict, List, Optional
 
 from telegram.utils import AsyncResult
+
 from tg import config
 from tg.models import Model
 from tg.msg import MsgProxy