NullReferenceException in ThingHelper.GetKey when pawn moves, triggered by VEF PhasingPatches (likely Miho race gene/ability)

[evxcdwolf]

RimWorld 1.6.4871 rev600, using the rimworld-1.6 branch of this fork (and Fishery rimworld-1.6).

Getting recurring exceptions while ticking pawns, right as they enter a new cell. Stack trace:

Exception ticking Корсак (at (151, 0, 180)): System.NullReferenceException: Object reference not set to an instance of an object
at PerformanceFish.Utility.ThingHelper.GetKey (Verse.Thing thing)
at FisheryLib.Collections.FishTable2[TKey,TValue].GetBucketIndex (TKey key) at FisheryLib.Collections.FishTable2[TKey,TValue].InsertAsTail (...)
at FisheryLib.Collections.FishTable2[TKey,TValue].InsertEntryInternal (...) at FisheryLib.Collections.FishTable2[TKey,TValue].InsertEntry (...)
at FisheryLib.Collections.IndexedFishSet`1[T].Add (T item)
at PerformanceFish.Listers.ThingsPrepatches.AddToTypeList (Verse.ListerThings lister, Verse.Thing thing)
at Verse.ListerThings.Add (Verse.Thing t)
at Verse.RegionListersUpdater.RegisterInRegions (Verse.Thing thing, Verse.Map map)
at Verse.Thing.set_Position (Verse.IntVec3 value)
- POSTFIX OskarPotocki.VEF: Void VEF.Hediffs.PhasingPatches:UnfogEnteredCells(Pawn_PathFollower __instance, Pawn ___pawn)
at Verse.AI.Pawn_PathFollower.TryEnterNextPathCell ()
at Verse.AI.Pawn_PathFollower.PatherTick ()
at Verse.Pawn.Tick ()
- PREFIX sakura_ta.ideotickopt: Void IdeoTickOpt.IdeoTickHarmonyPatches:PawnTickPrefix(Pawn __instance)

Right after this, a second pawn threw the same NullReferenceException at the same coordinates but during Remove (ListerThings.Remove → RemoveFromTypeList), and then two more pawns in the same area started throwing a different InvalidOperationException ("Operation is not valid due to the current state of the object") from the same IndexedFishSet, suggesting the earlier failures left the region's lister in a corrupted state.

Setup: Humanoid Alien Races with the Miho race mod active (map was mostly populated with Miho pawns at the time), plus Wolfein race mod. Not 100% sure which gene/ability on the affected pawns is triggering VEF's PhasingPatches, but it's consistently tied to VEF.Hediffs.PhasingPatches:UnfogEnteredCells in the stack.

Session ended shortly after this cluster of errors (log cuts off after a Memory Statistics dump), so this may be crashing the game.

Full log in file

Player.log