diff --git a/check_matrix_msg.py b/check_matrix_msg.py
index 4375ce5..01d6bc0 100755
--- a/check_matrix_msg.py
+++ b/check_matrix_msg.py
@@ -2,6 +2,7 @@ import argparse
 import asyncio
 import sys
 import time
+import traceback
 
 from nio import JoinResponse, RoomSendResponse