multiplayer crash?

[TripDering]

Version: 0.730a Steamy Hot Stable

Error: System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at SoG.Game1._EntityMaster_AddNPC(UInt16 iEnemyID, NPCTypes enEnemyType, Vector2 p_v2Pos) in (path)\Entities\EntityMaster.cs:line 1314
   at SoG.Game1._EntityMaster_AddNPC(NPCTypes enEnemyType, Vector2 p_v2Pos) in (path)\Entities\EntityMaster.cs:line 1302
   at SoG.Game1._EntityMaster_CreateNamedEntity(NPCTypes enID) in (path)\DialogueSystem n Cutscenes\CutsceneMaster.cs:line 865
   at SoG.CutsceneControl.OnSetup() in (path)\DialogueSystem n Cutscenes\CutsceneMaster.cs:line 273
   at SoG.CutsceneControl.Update() in (path)\DialogueSystem n Cutscenes\CutsceneMaster.cs:line 135
   at SoG.Game1._Cutscene_Update() in (path)\DialogueSystem n Cutscenes\CutsceneMaster.cs:line 908
   at SoG.Game1.Update(GameTime gameTime) in (path)\Game1.cs:line 1066 - FullScreen: No - NetworkRole: Client - MD5: 293d4b1510dd6a8537957358c7540ae8

Was playing a new hardmode 2P run and it crashed just at the start of the Freddy and Teddy battle.