I get Failed to compare two elements in the array when trying to filter a simple text column.
************** Exception Text **************
System.InvalidOperationException: Failed to compare two elements in the array. ---> System.ArgumentException: Object must be of type String.
   at System.String.CompareTo(Object value)
   at System.Collections.Comparer.Compare(Object a, Object b)
   at System.Array.GetPivotValue(IComparer comparer, Array keys, Int32 left, Int32 right)
   --- End of inner exception stack trace ---