got assertion failed ~30000 times and recover afterwards

Traceback (most recent call last):
File "dbconnector.py", line 32, in eval_cmd
res = eval_expr(block, variables)
File "dbconnector.py", line 25, in eval_expr
return eval(expr,

, variables )
File "<string>", line 1, in <module>
File "dbmodules.py", line 232, in login
user = mdb.users.find_and_modify(query=

, update={"$set": {USER_VERSION:ClientVersion}})
File "build/bdist.linux-x86_64/egg/pymongo/collection.py", line 1061, in find_and_modify
allowable_errors=[no_obj_error], **kwargs)
File "build/bdist.linux-x86_64/egg/pymongo/database.py", line 288, in command
_is_command=True)
File "build/bdist.linux-x86_64/egg/pymongo/collection.py", line 469, in find_one
for result in self.find(spec_or_id, *args, **kwargs).limit(-1):
File "build/bdist.linux-x86_64/egg/pymongo/cursor.py", line 601, in next
if len(self.__data) or self._refresh():
File "build/bdist.linux-x86_64/egg/pymongo/cursor.py", line 564, in _refresh
self._query_spec(), self._fields))
File "build/bdist.linux-x86_64/egg/pymongo/cursor.py", line 521, in __send_message
**kwargs)
File "build/bdist.linux-x86_64/egg/pymongo/connection.py", line 790, in _send_message_with_response
return self.__send_and_receive(message, sock)
File "build/bdist.linux-x86_64/egg/pymongo/connection.py", line 771, in __send_and_receive
return self.__receive_message_on_socket(1, request_id, sock)
File "build/bdist.linux-x86_64/egg/pymongo/connection.py", line 761, in __receive_message_on_socket
struct.unpack("<i", header[8:12])[0])
AssertionError: ids don't match -1484018265 895640889