Exception while calling NextTick callback (InvalidCastException: Null object cannot be converted to a value type.) at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00029] in <437ba245d8404784b9fbab9b439ac908>:0 at System.Convert.ChangeType (System.Object value, System.Type conversionType) [0x0000c] in <437ba245d8404784b9fbab9b439ac908>:0 at Oxide.Core.Plugins.Plugin.Call[T] (System.String hook, System.Object[] args) [0x00008] in :0 at Oxide.Plugins.StaffLogger.HookNightvision (BasePlayer player) [0x00000] in :0 at Oxide.Plugins.StaffLogger+c__AnonStorey4.<>m__0 () [0x00000] in :0 at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in :0

That actually looks like a problem with a "StaffLogger" plugin you are using.