Crash:

   7.849 Error ModManager.cpp:1765: Failed to load mod "Igrys": __Igrys__/Scripts/Other/BaseIntegration.lua:10: attempt to index field 'unit' (a nil value)
stack traceback:
        __Igrys__/Scripts/Other/BaseIntegration.lua:10: in main chunk
        [C]: in function 'require'
        __Igrys__/data.lua:35: in main chunk

Nexus changes the vanilla promethium science from ingredients based to trigger based in the latest update, and Igrys is apparently accessing the unit field on the technology without nil checking first, simple fix at least. :-)

Fixed
Also, thank you for this explanation, it really does accelerate the process.

No problem, I personally hate error reports that don't contain all useful information unless there's really no option for it. :-)

Thanks much, got it!