(20:30:34) | Failed to run a 1.00 timer in 'DangerousTreasures v2.0.7' (ArgumentNullException: Value cannot be null.
Parameter name: source)
at System.Linq.Enumerable.ToList[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x0000d] in <351e49e2a5bf4fd6beabb458ce2255f3>:0
at Oxide.Plugins.DangerousTreasures+TreasureChest.Unlock () [0x0017e] in <ad737527c6c347a9be1fc3b3cf7e752c>:0
at Oxide.Plugins.DangerousTreasures+TreasureChest.<Unlock>m__5 () [0x00000] in <ad737527c6c347a9be1fc3b3cf7e752c>:0
at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <ac41dd3599754d448b8c218b34645820>:0

Thanks. I added a null check to fix it.