ntdll.dll is part of the windows kernal, and you see it at the most crash repots.
I don't think that is the reason or you would have much more problems with other programs too.
Does it was a real crash ? That mean you got a window that tell's you rimworld crashed and a crash folder got created ?
Then you should look at these crash folder and look at the error.log it mosttime explain better what let rimworld crash.
nv....dll is the NVidea video driver then update or maybe downgrade the driver.
Just looked what card you use GTX 1050, there are serveral reports about that card like
https://ludeon.com/forums/index.php?topic=46729.0Or does rimworld just exited or stoped working ? But then i think it is the mod problem, like memory overflow or such kind, i am not an expert, and you should ask the devs from RimWar, i think they got more expierence about it.