Null-reference exception when engineers attempt to repair a part

[j-steve]

Engineer kerbals on EVA are not able to repair any parts. Clicking the "repair" button has no effect; the debug console reveals that OhScrap logs the Attempting repairs message, but it is followed immediately by a NullReferenceException.

This occurs on all parts (stock or modded).

By contrast other kerbals (e.g. scientists) are able to successfully repair these same items with no exception.

Note I was only able to test this with two kerbals, Bill and Bob, but I'm assuming the engineer vs scientist distinction is the culprit: Bob is able to repair items (or at least attempt the repair), but Bill gets an error every time.

[j-steve]

I found more context on this from another user, looks like it is caused by engineers specifically:

There is a bug when repairing parts with an engineer on EVA. OhScrap.ModuleUPFMEvents.RepairFailCheck throws a NullReferenceException. I think its to do with the if statement on line 215 of ModuleUPFMEvents.cs (2.2.99.0) because the error happens regardless of if the modifiers list to FailureRepairSkill exists (regardless of if the logic in 215 is true or not) but does not happen with crew that aren't engineers (bug occurs after entering the if statement at 213). its possible I did not remove the modifiers list to FailureRepairSkill because I don't really know what I am doing so 217 and 218 should still be considered suspect. I have some other mods going and I am on version 2.2.0.0 with KSP 1.12.5. I can do more trouble shooting if this isn't enough to point in the right direction. I did look to make sure another mod wasn't messing with FailureRepairSkill but I think its just this mod and stock game. I also might try to get your code in VS so I can add some debug lines but don't count on it, I am a big noob at C# and VS let alone KSP plugins.