diff --git a/tgbot/kollagen-bot/main.py b/tgbot/kollagen-bot/main.py
index 84ddda6..8bb26b7 100644
--- a/tgbot/kollagen-bot/main.py
+++ b/tgbot/kollagen-bot/main.py
@@ -43,7 +43,7 @@ class KollagenBot:
     def tg_generate(self, update: Update, context: CallbackContext):
         cmd_line = update.message.text.split(" ")[1:]
         self._process(cmd_line, update)
-        if context.user_data:
+        if context.user_data is not None:
             context.user_data["last_cmd_line"] = cmd_line
 
     def tg_regenerate(self, update: Update, context: CallbackContext):