I'm getting this error after installing this mod, hasn't happened before:

Could not execute post-long-event action. Exception: System.NullReferenceException: Object reference not set to an instance of an object
at RimWorld.Planet.Settlement.get_Material () [0x00015] in <32ce1f44d6b54e75a3209fc1c4a7e2db>:0
at RimWorld.Planet.WorldLayer_WorldObjects+<Regenerate>d__1.MoveNext () [0x000b8] in <32ce1f44d6b54e75a3209fc1c4a7e2db>:0
at Verse.GenCollection.ExecuteEnumerable (System.Collections.IEnumerable enumerable) [0x00010] in <32ce1f44d6b54e75a3209fc1c4a7e2db>:0
at RimWorld.Planet.WorldLayer.RegenerateNow () [0x0000d] in <32ce1f44d6b54e75a3209fc1c4a7e2db>:0
at RimWorld.Planet.WorldRenderer.RegenerateAllLayersNow () [0x00010] in <32ce1f44d6b54e75a3209fc1c4a7e2db>:0
at Planets_Code.Planets_CreateWorldParams.<CanDoNext>b__19_1 () [0x00022] in <bf71ff9d9e8642bda75cdf431938741e>:0
at Verse.LongEventHandler.ExecuteToExecuteWhenFinished () [0x0007c] in <32ce1f44d6b54e75a3209fc1c4a7e2db>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch1 (string)
Verse.LongEventHandler:ExecuteToExecuteWhenFinished ()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent ()
Verse.LongEventHandler:LongEventsUpdate (bool&)
(wrapper dynamic-method) Verse.Root:Verse.Root.Update_Patch2 (Verse.Root)
Verse.Root_Entry:Update ()

any ideas of a conflict and possible fix?