Throw ValueError: not enough values to unpack (expected 2, got 1) about iotop HOT 4 OPEN

lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 9.6 (stretch)
Release:        9.6
Codename:       stretch

uname -a
Linux testxyz 4.4.162-rk3399 #41 SMP Fri Oct 26 14:03:47 CEST 2018 aarch64 GNU/Linux

root@rockpro64:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:        18.04
Codename:       bionic
root@rockpro64:~# uname -a
Linux rockpro64 4.4.167-1181-rockchip-ayufan-gd20421e03128 #1 SMP Tue Apr 9 17:44:02 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
root@rockpro64:~# iotop --version
iotop 0.6
root@rockpro64:~# python --version
Python 2.7.15rc1
root@rockpro64:~# iotop
Traceback (most recent call last):
  File "/usr/sbin/iotop", line 17, in <module>
    main()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 620, in main
    main_loop()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 610, in <lambda>
    main_loop = lambda: run_iotop(options)
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 508, in run_iotop
    return curses.wrapper(run_iotop_window, options)
  File "/usr/lib/python3.6/curses/__init__.py", line 94, in wrapper
    return func(stdscr, *args, **kwds)
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 501, in run_iotop_window
    ui.run()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 155, in run
    self.process_list.duration)
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 434, in refresh_display
    lines = self.get_data()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 415, in get_data
    return list(map(format, processes))
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 388, in format
    cmdline = p.get_cmdline()
  File "/usr/lib/python3/dist-packages/iotop/data.py", line 292, in get_cmdline
    proc_status = parse_proc_pid_status(self.pid)
  File "/usr/lib/python3/dist-packages/iotop/data.py", line 196, in parse_proc_pid_status
    key, value = line.split(':\t', 1)
ValueError: not enough values to unpack (expected 2, got 1)