Exception while handling service_name: "datastore_v3"とか言われたら再起動すべし

ERROR    2016-02-28 07:30:52,824 api_server.py:272] Exception while handling service_name: "datastore_v3"
method: "Put"
request: "\n\320\001j,j\023dev~hoge-localr\025\013\022\021AuthrizationToken\014r\032\010\007\032\011CreatedAt \000*\011\010\275\363\340\230\370\231\313\002r\032\010\007\032\011UpdatedAt \000*\011\010\275\363\340\230\370\231\313\002r\016\032\006UserID \000*\002\010\001r)\032\013AccessToken \000*\030\032\026XQ5xT1e9RtqjkRdD2laTCgr*\032\014RefreshToken \000*\030\032\026Hy7EIN9XQEiX0q1KtbU_MA\202\001\000"
request_id: "CAggbZbuys"

Traceback (most recent call last):
  File "/Users/user1/go_appengine/google/appengine/tools/devappserver2/api_server.py", line 247, in _handle_POST
    api_response = _execute_request(request).Encode()
  File "/Users/user1/go_appengine/google/appengine/tools/devappserver2/api_server.py", line 189, in _execute_request
    make_request()
  File "/Users/user1/go_appengine/google/appengine/tools/devappserver2/api_server.py", line 181, in make_request
    request_id)
  File "/Users/user1/go_appengine/google/appengine/datastore/datastore_sqlite_stub.py", line 968, in MakeSyncCall
    response, request_id)
  File "/Users/user1/go_appengine/google/appengine/api/apiproxy_stub.py", line 131, in MakeSyncCall
    method(request, response)
  File "/Users/user1/go_appengine/google/appengine/datastore/datastore_stub_util.py", line 3217, in _Dynamic_Put
    transaction, self._trusted, self._app_id)
  File "/Users/user1/go_appengine/google/appengine/datastore/datastore_stub_util.py", line 2680, in Put
    full_key = self._AllocateIds([entity.key()])[0]
  File "/Users/user1/go_appengine/google/appengine/datastore/datastore_sqlite_stub.py", line 1470, in _AllocateIds
    'ScatteredIdCounters')
  File "/Users/user1/go_appengine/google/appengine/datastore/datastore_sqlite_stub.py", line 1394, in __AllocateIdsFromBlock
    next_id = c.fetchone()[0]
TypeError: 'NoneType' object has no attribute '__getitem__'

こんなエラーが出たら一度サーバを止めて
再度、

goapp serve

しましょう。
そしたら治るはずです...