Hello! We should have this fixed in our latest stable: 1.9.0.0.13066 ( https://github.com/triplea-game/triplea/releases/latest)
I opened a ticket within the TripleA project for coordination amongst the TripleA maintainers on this topic: https://github.com/triplea-game/triplea/issues/4372 @ssoloff, a Triple maintainer, confirmed a fix in the latest version (quoting from github#4372) > Using Oracle Java 11.0.1 with a Substance L&F active, I was able to repro the NPE at startup using 1.9.0.0.7062 on Fedora. I then ran both 1.9.0.0.13066 and 1.10.0.0.13112 in the same configuration, and no NPE was observed at startup. > Presumably the latest Substance binaries have fixed this issue. I'm eager for confirmation that this looks to be fixed, I'm happy to help with what I can in that effort.
