AttributeErrors on Serial AutoIncrement detection

asyncqlio/orm/schema/column.py

@@ -207,9 +207,12 @@ def autoincrement(self) -> bool:
         """
         Whether this column is set to autoincrement.
         """
-        if isinstance(self.table.metadata.bind.dialect, sqlite3.Sqlite3Dialect):
-            return self.primary_key and isinstance(self.type, md_types.Integer)
-        return isinstance(self.type, md_types.Serial)
+        try:
+            if isinstance(self.table.metadata.bind.dialect, sqlite3.Sqlite3Dialect):
+                return self.primary_key and isinstance(self.type, md_types.Integer)
+            return isinstance(self.type, md_types.Serial)
+        except AttributeError:
+            return False
 
     # DDL stuff
     @classmethod