diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index 7d71670..1153878 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -3,6 +3,7 @@ import enum
 import socket
 import datetime
 import fnmatch
+import traceback
 
 from typing import Optional
 
@@ -425,6 +426,8 @@ class Session():
         try:
             return fn(self, *args)
         except TypeError as e:
+            traceback.print_exception(e)
             return self.respond(ResponseCode.NNTP_SYNTAX_ERROR)
         except Exception as e:
+            traceback.print_exception(e)
             return self.respond(ResponseCode.NNTP_COMMAND_UNAVAILABLE)