My server crash with that a lots of time :

(00:41:22) | Failed to call hook 'OnEntitySpawned' on plugin 'ZoneManager v2.5.15' (NullReferenceException: )

at (wrapper managed-to-native) UnityEngine.Component.get_transform(UnityEngine.Component)

at Oxide.Plugins.ZoneManager+Zone.OnBuildingBlockEnter (BuildingBlock buildingBlock) [0x00063] in <489e28ebee7740af8908b64b19336578>:0

at Oxide.Plugins.ZoneManager.OnEntitySpawned (BaseNetworkable entity) [0x0008a] in <489e28ebee7740af8908b64b19336578>:0

at Oxide.Plugins.ZoneManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00433] in <489e28ebee7740af8908b64b19336578>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0