Noticed a error on worldgen, may or may not be related to the 1.6 release of VEF:

Faction Pest Company has null relation with . Returning dummy relation.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
RimWorld.Faction:RelationWith (RimWorld.Faction,bool)
RimWorld.Faction:RelationKindWith (RimWorld.Faction)
Verse.ColoredText:GetFactionRelationColor (RimWorld.Faction)
Verse.ColoredText:SwapTagWithColor (string,string,string)
Verse.ColoredText:Resolve (Verse.TaggedString)
Verse.TaggedString:Resolve ()
Verse.Grammar.GrammarUtility/<RulesForPawn>d__1:MoveNext ()
Verse.Book:GenerateBook (Verse.Pawn,System.Nullable`1<long>)
PossessionsForEveryone.PossessionUtility:GenerateAndGivePossessionsTo (Verse.Pawn,System.Collections.Generic.List`1<Verse.ThingDefCount>&)
PossessionsForEveryone.Patch_PawnGenerator:AddPossessions (Verse.Pawn,Verse.PawnGenerationRequest)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.PawnGenerator.GenerateOrRedressPawnInternal_Patch4 (Verse.PawnGenerationRequest)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.PawnGenerator.GeneratePawn_Patch3 (Verse.PawnGenerationRequest)
RimWorld.Faction:TryGenerateNewLeader ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.FactionGenerator.NewGeneratedFaction_Patch2 (RimWorld.Planet.PlanetLayer,RimWorld.FactionGeneratorParms)
RimWorld.FactionGenerator:CreateFactionAndAddToManager (RimWorld.Planet.PlanetLayer,RimWorld.FactionDef)
RimWorld.FactionGenerator:AddFactionToManager (RimWorld.Planet.PlanetLayer,RimWorld.FactionDef)
RimWorld.FactionGenerator:InitializeFactions (RimWorld.Planet.PlanetLayer,System.Collections.Generic.List`1<RimWorld.FactionDef>)
RimWorld.FactionGenerator:GenerateFactionsIntoWorldLayer (RimWorld.Planet.PlanetLayer,System.Collections.Generic.List`1<RimWorld.FactionDef>)
RimWorld.Planet.WorldGenStep_Factions:GenerateFresh (string,RimWorld.Planet.PlanetLayer)
RimWorld.Planet.WorldGenerator:GeneratePlanetLayer (RimWorld.Planet.PlanetLayer,string,int)
RimWorld.Planet.WorldGenerator:GenerateWorld (single,string,RimWorld.Planet.OverallRainfall,RimWorld.Planet.OverallTemperature,RimWorld.Planet.OverallPopulation,RimWorld.Planet.LandmarkDensity,System.Collections.Generic.List`1<RimWorld.FactionDef>,single)
RimWorld.Page_CreateWorldParams:<CanDoNext>b__20_0 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__28_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()