获取 reply_id 出错，如何解决？

reply_info = None
form = ReplyForm(self)
reply_info = {
...
}


reply_id = self.reply_model.get_reply(reply_info)


File "/usr/local/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
OperationalError: (1054, "Unknown column 'None' in 'where clause'")