Unable to change character on CB

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When attempting to change the character the following error occured and the changes were rerolled:

WotC.CharBuilder.DataModel.CharacterUpdateException: An error occurred while reloading the character ---> System.InvalidOperationException: Sequence contains more than one matching element    bij System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)    bij WotC.XAMLUtilities.ListHelpers.Update[TElementType,TKeyType](ICollection`1 list, IEnumerable`1 newitems, Func`3 areEqual, Func`2 elementGenerator, Action`2 update_existing)    bij WotC.CharBuilder.DataModel.Character.ExtractLoot(XElement loot)    bij WotC.CharBuilder.DataModel.Character.ExtractIfExists[TResultType](XName element, XElement root, Func`2 action)    bij WotC.CharBuilder.DataModel.Character.UpdateFromXml(CharacterState state, DateTime messageSent, DateTime startedProcessing)    bij WotC.CharBuilder.DataModel.Workspace.<>c__DisplayClass45.b__40(CharacterState state)   
--- Einde van intern uitzonderingsstackpad ---

Tried on 2 different machines. Same result after several tries.