protontricks crash after game selection window

[Frambooisier]

Describe the bug
I start protontricks via flatpak with run com.github.Matoking.protontricks --gui command, first window appears where I can select game to be configured, after selection and confirmation the window disappears and no new window or message appears. In terminal there is and error related to that can be seen in gist link below.

To Reproduce
Steps to reproduce the behavior:

1. Run command run com.github.Matoking.protontricks --gui
2. select game title in the protontricks window
3. crash, read the info from terminal

Expected behavior
if I start protontricks with --gui I expect to see first window with selection of a game, then after that I expect to see another window where I can select what I want to do with selected game's prefix

System (please complete the following information):

• Distro:
  Operating System: openSUSE Tumbleweed 20230617
  KDE Plasma Version: 5.27.5
  KDE Frameworks Version: 5.107.0
  Qt Version: 5.15.10
  Kernel Version: 6.3.7-1-default (64-bit)
  Graphics Platform: X11
  Processors: 20 × 12th Gen Intel® Core™ i7-12700K
  Memory: 15,4 GiB of RAM
  Graphics Processor: NVIDIA GeForce RTX 3070/PCIe/SSE2
  Manufacturer: Micro-Star International Co., Ltd.
  Product Name: MS-7D46
  System Version: 1.0

• Protontricks installation method: flatpak

• Protontricks version: 1.10.3

• Steam version: no beta, standard up-to-date

protontricks terminal output with -v flag (for some reason the formating of message in terminal is not correct, same as in gist)
https://gist.github.com/Frambooisier/0763abd948208f0fe95bb3d6c92e9b8d

[Matoking]

This looks like an issue with a missing locale. If you run the command locale -a, is pl_PL.utf8 listed?

If not, running sudo locale-gen to generate the missing locale might solve the problem; you might have to uncomment the pl_PL.utf8 locale in /etc/locale.gen first.

[Frambooisier]

yes pl_PL.utf8 is listed with locale -a command, on OpenSuse TW Im missing locale-gen command. My main system language is english and /etc/locale.conf only has LANG=en_US.UTF-8 but variable $LANG outputs LANG=pl_PL.UTF-8. I changed temporarly $LANG to LANG=en_US.UTF-8 and it did fix the problem, now I will add LANG=pl_PL.UTF-8 to /etc/locale.conf to see if it solves the problem permanently.

side note it seems suse use localedef so locale-gen is not present.