After loading this save, you will see an empty chest in front of you. Put some Uran235 from the inventory into this chest to kick on the kovarex enrichment process and the game just will freeze (kill it by taskmgr).
https://bergi9.de/crash.zip
p.s.: dunno why the upload files gives me errors, so i linked on extern hosters
[kovarex] [0.17.6][Win] Crash related to catalyst and productivity
Re: [kovarex] [0.17.6][Win] Crash for unknown reason
Thanks for the report, fixed for 0.17.7