Ancient Vampire Event spawn error

[safestsephiroth]

Have been trying to make Ancient Vampire event work consistently, and have been unable to. My process:

-Start new campaign
-Choose "Vampires - Strange cargo" scenario.
-Any storyteller (have tested all three basics, there is no apparent impact.)
-Generate the default suggested seed.
-Random tile.
-Accept random party.
-Pull vampire out of coffin, use devtools to instantly form a caravan of all colonists, then use devtools to force spawn the ancient vampire event.
-Use devtools to teleport caravan instantly to the event.

At this point, one of two things will happen: Either the vampire is in the coffin, or the below error is posted and the coffin is open and empty:

Exception from long event: System.NullReferenceException: Object reference not set to an instance of an object
at Vampire.VampireRelationUtility.SetSireChildeRelations (Verse.Pawn thisChilde, Vampire.CompVampire sireComp, Int32 optionalGeneration) [0x00000] in :0
at Vampire.CompVampire.InitializeVampirism (Verse.Pawn newSire, Vampire.BloodlineDef newBloodline, Int32 newGeneration, Boolean firstVampire) [0x00000] in :0
at Vampire.VampireGen.GenerateVampire (Int32 generation, Vampire.BloodlineDef bloodline, Verse.Pawn sire, RimWorld.Faction vampFaction, Boolean firstVampire) [0x00000] in :0
at Vampire.Building_CoffinSealed.b__1_0 () [0x00000] in :0
at Verse.LongEventHandler.UpdateCurrentSynchronousEvent (System.Boolean& sceneChanged) [0x00000] in :0

Tried to get relation between faction PlayerColony and itself.

Tried to get relation between faction PlayerColony and itself.

---

I have tried saving at planetfall and reloading the save to repeat the process from there, and there remains a roughly 50% chance that it works fine VS doesn't. I have tried this with a multitude of mods active (~144), this most recent series of attempts was done with only five, in this order:

(Core)
Hugslib
Jecstools
Rim of Madness - Vampires
Mod Manager
All Your Base

I can submit a save file after the error if that would be useful. I'm happy to help in any way I can, this mod is fantastic aside from this one perplexing issue!

Never used github before, hopefully I did this right. I can be contacted on the Rim of Madness Discord server at 24characters#2535 if more info is needed.

Hugslog entry from a failed 5 mods only attempt: https://gist.github.com/9af758c8edcc75d1ba4289e583cd39f2