Failed to call hook 'OnItemPickup' on plugin 'Arkan v1.0.20' (ArgumentException: At least one object must implement IComparable.)
  at System.Collections.Comparer.Compare (System.Object a, System.Object b) [0x00069] in <fb001e01371b4adca20013e0ac763896>:0

  at System.Collections.Generic.ObjectComparer`1[T].Compare (T x, T y) [0x00000] in <fb001e01371b4adca20013e0ac763896>:0

  at System.Collections.Generic.SortedDictionary`2+KeyValuePairComparer[TKey,TValue].Compare (System.Collections.Generic.KeyValuePair`2[TKey,TValue] x, System.Collections.Generic.KeyValuePair`2[TKey,TValue] y) [0x00014] in <14e3453b740b4bd690e8d4e5a013a715>:0