I have a zone around my town Undestrucable no heli targeting ect and heli destroyed town seeing everyone when heli comes over town I get..

Failed to call hook 'Unload' on plugin 'ZoneManager v3.0.91' (NullReferenceException: ) at (wrapper managed-to-native) UnityEngine.Component.get_gameObject(UnityEngine.Component) at Oxide.Plugins.ZoneManager.DestroyUpdateBehaviour () [0x0000e] in <860d1850f0494830849a2618bf6b24a0>:0 at Oxide.Plugins.ZoneManager.Unload () [0x00000] in <860d1850f0494830849a2618bf6b24a0>:0 at Oxide.Plugins.ZoneManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00db4] in <860d1850f0494830849a2618bf6b24a0>:0 at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <3606d2af539c45e4b5c61658e6a8b307>:0 at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0 at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0;