Can't debug package sh on Pycharm 2018.3.3

PY-183.5153.39, JRE 1.8.0_152-release-1343-b26x64 JetBrains s.r.o, OS Linux(amd64) v4.15.0-29deepin-generic, screens

I'm having issues while debugging (doesn't happen when a run it) a code which use a package named sh with Pycharm 2018.3.3. However this doesn't happen with Pycharm 2017.1.1.

This is the code

import sh

print(str(sh.ls('/')))

print('Ok')