Using shift+hjkl with i3expo open causes it to stop responding

[matejdro]

Exception in thread Thread-3 (show_ui):
Traceback (most recent call last):
  File "/usr/lib/python3.10/threading.py", line 1009, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.10/threading.py", line 946, in run
    self._target(*self._args, **self._kwargs)
  File "/.../i3expo-ng/./i3expod.py", line 757, in show_ui
    cmd += 'move workspace to output ' + new_wss_output[active_frame].name + ';'
KeyError: None