Same here, here's my error.

Exception in UIRootUpdate: System.NullReferenceException: Object reference not set to an instance of an object
[Ref F43534E]
at Shashlichnik.PlaceWorker_CloseToOtherCaverns+<>c__DisplayClass0_0.<AllowsPlacing>b__2 (RimWorld.Frame x) [0x00006] in <717b72b0a7e94277a997b170c88c306a>:0
at System.Linq.Enumerable.Any[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) [0x0002c] in <351e49e2a5bf4fd6beabb458ce2255f3>:0
at Shashlichnik.PlaceWorker_CloseToOtherCaverns.AllowsPlacing (Verse.BuildableDef checkingDef, Verse.IntVec3 loc, Verse.Rot4 rot, Verse.Map map, Verse.Thing thingToIgnore, Verse.Thing thing) [0x0006c] in <717b72b0a7e94277a997b170c88c306a>:0
at RimWorld.GenConstruct.CanPlaceBlueprintAt_NewTemp (Verse.BuildableDef entDef, Verse.IntVec3 center, Verse.Rot4 rot, Verse.Map map, System.Boolean godMode, Verse.Thing thingToIgnore, Verse.Thing thing, Verse.ThingDef stuffDef, System.Boolean ignoreEdgeArea, System.Boolean ignoreInteractionSpots, System.Boolean ignoreClearableFreeBuildings) [0x00837] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- TRANSPILER Uuugggg.rimworld.Replace_Stuff.main: IEnumerable`1 Replace_Stuff.NormalBuildReplace:Transpiler(IEnumerable`1 instructions)
- TRANSPILER Uuugggg.rimworld.Replace_Stuff.main: IEnumerable`1 Replace_Stuff.OverMineable.BlueprintOverFogged:Transpiler(IEnumerable`1 instructions)
- POSTFIX Uuugggg.rimworld.Replace_Stuff.main: Void Replace_Stuff.NormalBuildReplace:Postfix(AcceptanceReport& __result, BuildableDef entDef, IntVec3 center, Rot4 rot, Map map, Boolean godMode, Thing thingToIgnore)
- POSTFIX Loconeko.Rimworld.RoadsOfTheRim: Void RoadsOfTheRim.HarmonyPatches.GenConstruct_CanPlaceBlueprintAt_NewTemp:Postfix(AcceptanceReport& __result, BuildableDef entDef, IntVec3 center, Map map)
at RimWorld.GenConstruct.CanPlaceBlueprintAt (Verse.BuildableDef entDef, Verse.IntVec3 center, Verse.Rot4 rot, Verse.Map map, System.Boolean godMode, Verse.Thing thingToIgnore, Verse.Thing thing, Verse.ThingDef stuffDef, System.Boolean ignoreEdgeArea, System.Boolean ignoreInteractionSpots) [0x00029] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- POSTFIX com.SupesSolutions.ParallelPowerGrid: Void Parallel_PowerGrid.Patcher:CanPlace(BuildableDef entDef, IntVec3 center, Rot4 rot, Map map, Boolean godMode, Thing thingToIgnore, Thing thing, ThingDef stuffDef, AcceptanceReport& __result)
at RimWorld.Designator_Build.CanDesignateCell (Verse.IntVec3 c) [0x0004a] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- PREFIX Uuugggg.rimworld.Replace_Stuff.main: Void Replace_Stuff.DesignatorContext:Prefix(Designator_Build __instance)
- POSTFIX Uuugggg.rimworld.Replace_Stuff.main: Void Replace_Stuff.DesignatorContext:Postfix()
- POSTFIX kopp.rimworld.caravanformationimprovements: Void CaravanFormationImprovements.CanDesignateCell_Postfix:Postfix(AcceptanceReport& __result, IntVec3 c, Designator_Build __instance, BuildableDef ___entDef, Rot4 ___placingRot)
at (wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition.Glue:AbiFixup<Verse.AcceptanceReport RimWorld.Designator_Build:CanDesignateCell(Verse.IntVec3),Verse.AcceptanceReport RimWorld.Designator_Build.CanDesignateCell_Patch3(RimWorld.Designator_Build, Verse.IntVec3)>(RimWorld.Designator_Build,Verse.AcceptanceReport&,Verse.IntVec3)
at RimWorld.Designator_Place.SelectedUpdate () [0x00059] in <630e2863bc9a4a3493f2eff01e3a9556>:0
at RimWorld.Designator_Build.SelectedUpdate () [0x00000] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- POSTFIX Kikohi.PipeSystem: Void PipeSystem.Designator_Build_Patch:Postfix(BuildableDef ___entDef)
at Verse.DesignatorManager.DesignatorManagerUpdate () [0x00016] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- POSTFIX net.pardeike.rimworld.mods.achtung: Void AchtungMod.DesignatorManager_DesignatorManagerUpdate_Patch:Postfix()
at RimWorld.MapInterface.MapInterfaceUpdate () [0x0002e] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- POSTFIX SmashPhil.VehicleFramework: Void Vehicles.MapHandling:DebugUpdateVehicleRegions()
- POSTFIX ShipInteriorMod2: Void SaveOurShip2.DrawShips:Postfix()
at RimWorld.UIRoot_Play.UIRootUpdate () [0x00015] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- POSTFIX visiblewealth.1trickPwnyta: Void VisibleWealth.Patch_UIRoot_Play_UIRootUpdate:Postfix()
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch4 (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.UIRoot_Play.UIRootUpdate_Patch1 (RimWorld.UIRoot_Play)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root.Update_Patch3 (Verse.Root)
Verse.Root_Play:Update ()

same

got this error

Exception in UIRootUpdate: System.NullReferenceException: Object reference not set to an instance of an object
[Ref DBA053C1]
at Shashlichnik.PlaceWorker_CloseToOtherCaverns+<>c__DisplayClass0_0.<AllowsPlacing>b__1 (RimWorld.Blueprint_Build x) [0x00006] in <8ca6a8b2eab6491b964b730dc039e1e1>:0
at System.Linq.Enumerable.Any[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) [0x0002c] in <1f993cbf88314b1baa1e10ca917bdc64>:0
at Shashlichnik.PlaceWorker_CloseToOtherCaverns.AllowsPlacing (Verse.BuildableDef checkingDef, Verse.IntVec3 loc, Verse.Rot4 rot, Verse.Map map, Verse.Thing thingToIgnore, Verse.Thing thing) [0x00046] in <8ca6a8b2eab6491b964b730dc039e1e1>:0
at RimWorld.GenConstruct.CanPlaceBlueprintAt (Verse.BuildableDef entDef, Verse.IntVec3 center, Verse.Rot4 rot, Verse.Map map, System.Boolean godMode, Verse.Thing thingToIgnore, Verse.Thing thing, Verse.ThingDef stuffDef, System.Boolean ignoreEdgeArea, System.Boolean ignoreInteractionSpots, System.Boolean ignoreClearableFreeBuildings) [0x00491] in <981a33edf24d499488b0f820d94638e1>:0
at RimWorld.Designator_Build.CanDesignateCell (Verse.IntVec3 c) [0x00035] in <981a33edf24d499488b0f820d94638e1>:0
at RimWorld.Designator_Place.SelectedUpdate () [0x0005f] in <981a33edf24d499488b0f820d94638e1>:0
at RimWorld.Designator_Build.SelectedUpdate () [0x00000] in <981a33edf24d499488b0f820d94638e1>:0
- POSTFIX Kikohi.PipeSystem: Void PipeSystem.Designator_Build_Patch:Postfix(BuildableDef ___entDef)
at Verse.DesignatorManager.DesignatorManagerUpdate () [0x00013] in <981a33edf24d499488b0f820d94638e1>:0
at RimWorld.MapInterface.MapInterfaceUpdate () [0x00033] in <981a33edf24d499488b0f820d94638e1>:0
- POSTFIX SmashPhil.VehicleFramework: Void Vehicles.Patch_MapHandling:DebugUpdateVehicleRegions()
at RimWorld.UIRoot_Play.UIRootUpdate () [0x00015] in <981a33edf24d499488b0f820d94638e1>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
RimWorld.UIRoot_Play:UIRootUpdate ()
Verse.Root:Update ()
Verse.Root_Play:Update ()

Can you confirm your mod is up to date?
I've sent a possible fix few hours ago.

Can confirm your update fixed it, many thanks

Originally posted by Destroyerbot5:

Can confirm your update fixed it, many thanks

Glad to hear it