I'm getting: 

Failed to call hook 'Unload' on plugin 'ZoneManager v3.0.21' (NullReferenceException: ) at (wrapper managed-to-native) UnityEngine.Component.get_gameObject(UnityEngine.Component) at Oxide.Plugins.ZoneManager.DestroyUpdateBehaviour () [0x0000e] in :0 at Oxide.Plugins.ZoneManager.Unload () [0x00000] in :0 at Oxide.Plugins.ZoneManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00db4] in :0 at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <60c318df79ed41688ea59335e48d61ad>:0 at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <9882f28dc2204b4dba514a9ad18f5042>:0 at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0