diff --git a/matrix_appservice_kakaotalk/db/portal.py b/matrix_appservice_kakaotalk/db/portal.py
index ead8b38..6a97212 100644
--- a/matrix_appservice_kakaotalk/db/portal.py
+++ b/matrix_appservice_kakaotalk/db/portal.py
@@ -50,7 +50,7 @@ class Portal:
         data = {**row}
         ktid = data.pop("ktid")
         kt_receiver = data.pop("kt_receiver")
-        return cls(**data, ktid=Long.from_optional_bytes(ktid), kt_receiver=Long.from_optional_bytes(kt_receiver))
+        return cls(**data, ktid=Long.from_bytes(ktid), kt_receiver=Long.from_bytes(kt_receiver))
 
     @classmethod
     def _from_optional_row(cls, row: Record | None) -> Portal | None: