Thanks for reporting, I uploaded a fixed version, shouldn't happen anymore...
Tested with Expanded Lights and Decor Lights.. did not test with the new DLC

still crashed
NullReferenceException: Object reference not set to an instance of an object

DarknessNotIncluded.UnitOrientation.GetCurrentOrientation () (at <0ff0a87878d640eb8b58524b05714116>:0)
DarknessNotIncluded.UnitOrientation.Sim33ms (System.Single dt) (at <0ff0a87878d640eb8b58524b05714116>:0)
SimAndRenderScheduler+Sim33msUpdater.Update (ISim33ms updater, System.Single dt) (at <42a58da1d7eb4994b452d944564c213e>:0)
UpdateBucketWithUpdater`1[DataType].Update (System.Single dt) (at <42a58da1d7eb4994b452d944564c213e>:0)
StateMachineUpdater+BucketGroup.AdvanceOneSubTick (System.Single dt) (at <42a58da1d7eb4994b452d944564c213e>:0)
StateMachineUpdater.AdvanceOneSimSubTick () (at <42a58da1d7eb4994b452d944564c213e>:0)
Game.SimEveryTick (System.Single dt) (at <ade4ebd17f71495b9476a7e52f977fe6>:0)
Game.Update () (at <ade4ebd17f71495b9476a7e52f977fe6>:0)

Build: U52-626616-V

tested it twice and couldnt place lamp without crash

did you run the mod updater? or can you send the save

i tried to force update and it didnt work, said that it updated but the issue is still there

when you open the options you see the version number... currently I cant reproduce the error on my side anymore

you mentioned when i select a lamp to build it immediately crashes, is this still happening with 1.3.9 ? would you mind to send the save if it does, so I can fix that ;)

its when i drag it out of the build menu that it crashes

yeah, still without savegame I can't help you much, as I dont see the errors to fix...