Tweepy JSON：'NoneType'对象没有属性'__getitem__'

嘿我的代码目前正在将实时推文流式传输到数据库 . 然而，代码将运行一段时间，5-10分钟;它最终会给我以下错误并退出：

文件“twittergeo.py”，第198行，in

文件"/Library/Python/2.7/site-packages/tweepy/streaming.py"，第445行，在过滤器self._start（async）文件"/Library/Python/2.7/site-packages/tweepy/streaming.py"，第361行，在_start self._run（）文件"/Library/Python/2.7/site-packages/tweepy/streaming.py"，第294行，在_run引发异常TypeError：'NoneType' object没有属性' getitem '

from tweepy import Stream
from tweepy import OAuthHandler
from tweepy.streaming import StreamListener
import json
import MySQLdb

canada =[-141.0,41.7,-51.0,83.7]

consumer_key = '????????????'
consumer_secret = '??????????????' 
access_token = '????????????????????????'
access_secret = '??????????????'

class TweetListener(StreamListener):




   def on_data(self, data):
      alldata = json.loads(data)
      newdata = json.dumps(data)

      created_at =        alldata["created_at"] #primary key
      tweetId =           alldata["id"]
      text =              alldata["text"]#must be above the dictlists

      userId =            alldata["user"]["id"] #primarykey
      twitterHandle =     alldata["user"]["screen_name"]
      name =              alldata["user"]["name"]
      location =          alldata["user"]["location"]
      url =               alldata["user"]["url"]
      bio =               alldata["user"]["description"]
      protected =         alldata["user"]["protected"]
      followers_count =   alldata["user"]["followers_count"]
      friends_count =     alldata["user"]["friends_count"]
      geo_enabeled =      alldata["user"]["geo_enabled"]
      lang =              alldata["user"]["lang"]
      profile_image_url = alldata["user"]["profile_image_url"]

      placeId =           alldata["place"]["id"]#primarykey
      cityName =          alldata["place"]["name"]
      fullName =          alldata["place"]["full_name"]
      country_code =      alldata["place"]["country_code"]
      country =           alldata["place"]["country"]
      bounding_box =      alldata["place"]["bounding_box"]  #bug

      hashtags =          alldata["entities"]["hashtags"]  #bug
      user_mentions =     alldata["entities"]["user_mentions"]

  return True

   def on_error(self, status):

auth = OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_token, access_secret)

stream = Stream(auth, TweetListener())
stream.filter(locations=canada)

然而，Iv查看了StackOverflow并尝试了一些解决方案;似乎没有工作 .