Importing ps_mem in ipython crashes the interpreter

[gnud]

To reproduce sudo $(which ipython)

import ps_mem
ps_mem.main()

prints to STDOUT the table, but says about STDOUT:

Error in sys.excepthook:

Original exception was:

Using Kubuntu 18.04 Linux 5.0.x iPython 7.12.0 python 3.6.9

However, in python 3 default interpreter works without a crash.