Error: list index out of range

[Anton]

Please explain why this error occurs and how to fix it?
Aug 6 11:19:20 sw4 object-server: 10.0.1.13/cold7/0 EXCEPTION in ssync.Receiver: #012Traceback (most recent call last):#012 File "/usr/lib/python2.7/site-packages/swift/obj/ssync_receiver.py", line 165, in __call__#012 for data in self.missing_check():#012 File "/usr/lib/python2.7/site-packages/swift/obj/ssync_receiver.py", line 350, in missing_check#012 want = self._check_missing(line)#012 File "/usr/lib/python2.7/site-packages/swift/obj/ssync_receiver.py", line 293, in _check_missing#012 remote = decode_missing(line)#012 File "/usr/lib/python2.7/site-packages/swift/obj/ssync_receiver.py", line 41, in decode_missing#012 t_data = urllib.parse.unquote(parts[1])#012IndexError: list index out of range