It's been reported already and resolved for next release

See: viewtopic.php?t=68529

Glad I'm not the only one then. Should make it easier to track and fix!

I think this may be an issue left as a remnant as part of 17.19 as that was when it started, however still present with 17.20. The game crashes whenever I press 'B' to open my blueprint library. Mods include: Dectorio 0.9.9 EvoGUI 0.4.401 ModuleInserter 4.0.4 Nanobots 3.0.6 Squeak Through 1.3.0 Todo...

The tech tree is sorted, thank for the quick fix, however my game crashes when I open up my blueprints screen.