human
Solve the following python programming problem given the following code:
@ defer.inlineCallbacks 
def add_tag_to_room(self, user_id, room_id, tag, content) : 
    'Add a tag to a room for a user.
        Args:
            user_id(str): The user to add a tag for.
            room_id(str): The room to add a tag for.
            tag(str): The tag name to add.
            content(dict): A json object to associate with the tag.
        Returns:
            A deferred that completes once the tag has been added.
        ' 
    content_json = json.dumps (content) 
    def add_tag_txn(txn, next_id) : 
        self._simple_upsert_txn (txn, table = 'room_tags', keyvalues = { 
            'user_id' : user_id, 
            'room_id' : room_id, 
            'tag' : tag, 
}, values = { 
            'content' : content_json, 
}) 
        self._update_revision_txn (txn, user_id, room_id, next_id) 
with self._account_data_id_gen.get_next () as next_id : 
        (yield self.runInteraction ('add_tag', next_id, next_id)) 
self.get_tags_for_user.invalidate ((user_id,)) 
    result = self._account_data_id_gen.get_max_token () 
    defer.returnValue (result) 

    
    

    Fix the buggy line: (yield self.runInteraction ('add_tag', next_id, next_id))
assistant
#Here is Python code to fix the buggy line: (yield self.

(yield self.runInteraction ('add_tag', def add_tag_txn(, next_id))