Psychopy crashes after I press ok in compatibility information window

As the title says, Psychopy crashes after I press ok in the compatibility information window (and ok in the next tip window).

I found the last_app_load.txt file and this is what it shows:

pygame 1.9.6
Hello from the pygame community.
3.1864 	INFO 	Loaded SoundDevice with PortAudio V19.6.0-devel, revision 396fe4b6699ae929d3a685b3ef8a7e97396139a4
3.1865 	INFO 	sound is using audioLib: sounddevice
3.1865 	WARNING 	We strongly recommend you activate the PTB sound engine in PsychoPy prefs as the preferred audio engine. Its timing is vastly superior. Your prefs are currently set to use ['sounddevice', 'PTB', 'pyo', 'pygame'] (in that order).
Traceback (most recent call last):
  File "C:\Program Files\PsychoPy3\Lib\site-packages\psychopy\app\", line 104, in <module>
  File "C:\Program Files\PsychoPy3\Lib\site-packages\psychopy\app\", line 100, in main
  File "C:\Program Files\PsychoPy3\Lib\site-packages\psychopy\app\", line 28, in start_app
    app = PsychoPyApp(0, showSplash=showSplash)
  File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\", line 210, in __init__
    self.onInit(testMode=testMode, **kwargs)
  File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\", line 440, in onInit
  File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy\", line 300, in flush
  File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy\", line 286, in flush
    target.write(formatted[thisEntry] + '\n')
  File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy\", line 206, in write
  File "C:\Program Files\PsychoPy3\lib\encodings\", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u0391' in position 52: character maps to <undefined>

Any ideas what might be causing this?

This experiment contains an old rating scale with values in Greek. I am using Psychopy 2020.1.3 on a Windows 10 machine.