Game crashed when I tried to access the "Planet picker" with the mod enabled.
I am unsure what a "Planet picker" is that you are referring to. A bit of clarity and I'll look into it!
In Nexerelin, you have the option to start with your own planet and faction. When starting with your own faction, the "Planet picker" will let you add stuff in your planet, like heavy industry, military base, volatiles, rare ores, metal ores, farming terrain, population boost, etc. It also lets you pick blueprint packages, like low tech, high tech and midline blueprint packages and packages from playable factions. I think it crahsed because it couldn't find the Hiver blueprint package.