Posting here because comment section gives charlimit error.

Exception in UIRootUpdate: System.NullReferenceException: Object reference not set to an instance of an object
at RimWorld.GenThing.TrueCenter (Verse.Thing t) [0x00016] in <c36f9493c9844ddaa7fb5c788416098f>:0
at DoorsExpanded.Building_DoorRemoteButton.DrawExtraSelectionOverlays () [0x0001c] in <7aa0723df847497d88a1f45294e51557>:0
at (wrapper dynamic-method) RimWorld.SelectionDrawer.RimWorld.SelectionDrawer.DrawSelectionOverlays_Patch2()
at (wrapper dynamic-method) RimWorld.MapInterface.RimWorld.MapInterface.MapInterfaceUpdate_Patch2(RimWorld.MapInterface)
at RimWorld.UIRoot_Play.UIRootUpdate () [0x00015] in <c36f9493c9844ddaa7fb5c788416098f>:0
Verse.Log:Verse.Log.Error_Patch2(String, Boolean)
RimWorld.UIRoot_Play:UIRootUpdate()
Verse.Root:Verse.Root.Update_Patch1(Root)
Verse.Root_Play:Verse.Root_Play.Update_Patch1(Root_Play)

So I don't use a killbox because very often raids drop on top of my base. I have one lever connected to like 20 doors to put my base into lockdown mode to slow down raider movement.

If I click the lever, only about 4 links are shown. The debug window pops up and shows this error with a number in front just going up indefinitely.

I have a gigantic modlist, probably several hundred mods. Nothing that should conflict though. I don't use locks or other door mods.

The base is like 12 years old (in-game obviously :p) and many of the doors have been destroyed and rebuilt automatically. Their stuff is hardened ceramic from the ceramics mod.

Any new doorlinks I add to new doors also do not show up on the map, but still work.

The features all work except for the links showing and the log getting spammed.

The log gets spammed even if the game is paused. I only need to click on the door lever and the log pops up to show the red error.