I've been trying to duplicate teaching error and accidently found this on game start (with only VSIE + VEF loaded).

https://gist.github.com/HugsLibRecordkeeper2/211d7b0350ea1e4af31897e5f7a0355d

Accessing TicksAbs but gameStartAbsTick is not set yet (you most likely want to use GenTicks.TicksAbs instead).
Verse.Log:Error(String, Boolean)
Verse.Log:ErrorOnce(String, Int32, Boolean)
Verse.TickManager:get_TicksAbs()
RimWorld.TaleFactory:MakeRawTale(TaleDef, Object[])
RimWorld.TaleRecorder:RecordTale(TaleDef, Object[])
VanillaSocialInteractionsExpanded.SetFaction_Patch:Prefix(Pawn, Faction, Pawn)
Verse.Pawn:Verse.Pawn.SetFaction_Patch2(Pawn, Faction, Pawn)
Verse.Pawn:Notify_PassedToWorld()
RimWorld.Planet.WorldPawns:AddPawn(Pawn)
RimWorld.Planet.WorldPawns:PassToWorld(Pawn, PawnDiscardDecideMode)
Verse.GameInitData:PrepForMapGen()
RimWorld.<>c:<InitGameStart>b__1_0()
Verse.LongEventHandler:RunEventFromAnotherThread(Action)
Verse.<>c:<UpdateCurrentAsynchronousEvent>b__27_0()
System.Threading.ThreadHelper:ThreadStart_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object)
System.Threading.ThreadHelper:ThreadStart()



I remember Psychology spawning similar error on Prepare Carefully screen 100% times.