Python "AttributeError: 'NoneType' object has no attribute 'strip'"

###前提・実現したいこと
Tweepyでツイートを収集してMySQLに登録したいと思っています。
普通に動くのですが、しばらくするとこのエラーが出てきて困っています。

###発生している問題・エラーメッセージ

エラーメッセージ

Traceback (most recent call last):
File "C:/Users/aaa/OneDrive/Python project/streamingapi.py", line 91, in <module>
stream.filter(locations=[139.605839, 35.436093, 139.670899, 35.470702])
File "C:\Python34\lib\site-packages\tweepy\streaming.py", line 445, in filter
self._start(async)
File "C:\Python34\lib\site-packages\tweepy\streaming.py", line 361, in _start
self._run()
File "C:\Python34\lib\site-packages\tweepy\streaming.py", line 294, in _run
raise exception
File "C:\Python34\lib\site-packages\tweepy\streaming.py", line 263, in _run
self._read_loop(resp)
File "C:\Python34\lib\site-packages\tweepy\streaming.py", line 313, in _read_loop
line = buf.read_line().strip()
AttributeError: 'NoneType' object has no attribute 'strip'

###該当のソースコード

Python
1
2class Listener(tweepy.StreamListener):
3    """ Handles tweets received from the stream. """
4
5    def on_status(self, status):
6        times = status.created_at + timedelta(hours=9)
7        screen_name = "@" + status.author.screen_name
8        place = status.place.name  # 場所
9        geo = str(status.coordinates)  # 緯度・経度
10        text_data = status.text  # ツイート内容
11
12        # データベースに接続
13        connect = mysql.connector.connect(user='***',
14                                          password='***',
15                                          host='***',
16                                          database='***',
17                                          charset='utf8mb4',
18                                          buffered=True
19                                          )
20
21        cursor = connect.cursor()
22
23        # insert
24        sql = 'insert into streaming_table VALUES (id, %s, %s, %s, %s, %s)'
25        cursor.execute(sql, (times, screen_name, place, geo, text_data))
26
27        # select
28        cursor.execute('select * from streaming_table')
29        connect.commit()
30
31        # データベースから切断
32        cursor.close()
33        connect.close()
34
35        return True
36
37    def on_error(self, status_code):
38        print('Got an error with status code: ' + str(status_code))
39        return True
40
41    def on_timeout(self):
42        print('Timeout...')
43        return True
44
45
46listener = Listener()
47stream = tweepy.Stream(auth, listener)
48stream.filter(locations=[139.605839, 35.436093, 139.670899, 35.470702])
49
50
51