iotop crash

sudo iotop

Traceback (most recent call last):
File "/usr/sbin/iotop", line 17, in
main()
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 620, in main
main_loop()
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 610, in
main_loop = lambda: run_iotop(options)
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 508, in run_iotop
return curses.wrapper(run_iotop_window, options)
File "/usr/lib/python2.7/curses/wrapper.py", line 43, in wrapper
return func(stdscr, *args, **kwds)
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 501, in run_iotop_window
ui.run()
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 155, in run
self.process_list.duration)
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 434, in refresh_display
lines = self.get_data()
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 415, in get_data
return list(map(format, processes))
File "/usr/lib/python2.7/dist-packages/iotop/ui.py", line 388, in format
cmdline = p.get_cmdline()
File "/usr/lib/python2.7/dist-packages/iotop/data.py", line 292, in get_cmdline
proc_status = parse_proc_pid_status(self.pid)
File "/usr/lib/python2.7/dist-packages/iotop/data.py", line 196, in parse_proc_pid_status
key, value = line.split(':\t', 1)
ValueError: need more than 1 value to unpack