Fail start server after updagte to 3.1.42

After update from 3.1.38 to 3.1.42 the server no longer starts with the following messages:

Mär 22 13:35:58 flexget[3945]: 2020-03-22 13:35:58 INFO     web_server_daemon                 Registering WebUI v2
Mär 22 13:35:58 flexget[3945]: 2020-03-22 13:35:58 INFO     web_server                    Web server started at http://127.0.1.1:5050
Mär 22 13:35:58 flexget[3945]: 2020-03-22 13:35:58 INFO     web_server                    API available at http://127.0.1.1:5050/api
Mär 22 13:35:58 flexget[3945]: 2020-03-22 13:35:58 INFO     web_server                    WebUI (v1) available at http://127.0.1.1:5050/v1/
Mär 22 13:35:58 flexget[3945]: 2020-03-22 13:35:58 INFO     web_server                    WebUI (v2) available at http://127.0.1.1:5050/
Mär 22 13:35:58 flexget[3945]: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
Mär 22 13:35:58 flexget[3945]: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
Mär 22 13:35:58 flexget[3945]: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed
Mär 22 13:35:58 systemd[1]: flexget.service: Main process exited, code=dumped, status=11/SEGV
Mär 22 13:35:58 systemd[1]: flexget.service: Failed with result 'core-dump'.

does anyone have any advice? I have already tried a complete reinstallation without success.
Python 3.7.5
Flexget 3.1.42
no virtualenv
install pip (pip3) global

It is the same issue with that raised by me: Segmentation fault in daemon mode

thanks for the hint. then I’m not the only one.

SOLVED after upgrade to 3.1.44 #2633