[1.0.1940] Random Error Related to Item Stash Quest

[Diana Winters]

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System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.IncidentWorker_QuestItemStash.GetLetterText (RimWorld.Faction alliedFaction, System.Collections.Generic.List`1 items, Int32 days, RimWorld.SitePartDef sitePart, Boolean sitePartsKnown) [0x0001e] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Game\Storyteller\Incidents\Workers\World\Quests\IncidentWorker_QuestItemStash.cs:106
  at RimWorld.IncidentWorker_QuestItemStash.TryExecuteWorker (RimWorld.IncidentParms parms) [0x000aa] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Game\Storyteller\Incidents\Workers\World\Quests\IncidentWorker_QuestItemStash.cs:62
  at RimWorld.IncidentWorker.TryExecute (RimWorld.IncidentParms parms) [0x00003] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Defs\DefTypes\IncidentDef.cs:265
  at RimWorld.Storyteller.TryFire (RimWorld.FiringIncident fi) [0x0003e] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Game\Storyteller\Storyteller.cs:124
  at RimWorld.Storyteller.StorytellerTick () [0x0004d] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Game\Storyteller\Storyteller.cs:115
  at Verse.TickManager.DoSingleTick () [0x00201] in C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Ticking\TickManager.cs:334
Verse.Log:Error(String, Boolean) (at C:\Dev\RimWorld\Assets\Scripts\Verse\Utility\Debug\Log\Log.cs:78)
Verse.TickManager:DoSingleTick() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Ticking\TickManager.cs:335)
Verse.TickManager:TickManagerUpdate() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Ticking\TickManager.cs:261)
Verse.Game:UpdatePlay() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Game.cs:505)
Verse.Root_Play:Update() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Global\Root\Root_Play.cs:99)

Got this at a random time while using Cassandra Rough

[ison]

Do you still maybe have the savefile? Has anyone else got the same error?