Hi there samapatti,
It looks like that is a conflict with an outdated version of nwjs.
To fix this, you can try downloading version 0.43.6 from here: https://dl.nwjs.io/v0.43.6/nwjs-v0.43.6-linux-x64.tar.gz
Once downloaded, open the archive and extract the files over the top of the game folder, overwriting any files when asked.
Hopefully this should fix the issue and allow you to run the game!
If you still encounter any issues, please attempt to redownload the game as a new version with an updated nwjs library has been uploaded.
Thanks for supporting us!