diff --git a/matrix_appservice_kakaotalk/portal.py b/matrix_appservice_kakaotalk/portal.py
index 60eb270..816ddf9 100644
--- a/matrix_appservice_kakaotalk/portal.py
+++ b/matrix_appservice_kakaotalk/portal.py
@@ -1088,6 +1088,7 @@ class Portal(DBPortal, BasePortal):
         if chat_text:
             events = await self._handle_kakaotalk_text(
                 intent=intent,
+                attachment=None,
                 timestamp=timestamp,
                 chat_text=chat_text,
             )