(19:47:13) | Failed to call hook 'OnEntityKill' on plugin 'ZoneManager v3.0.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ZoneManager+Zone.OnEntityExitZone (BaseEntity baseEntity, System.Boolean resetDecay) [0x00000] in <ad976e052948470e9408b30239852ed4>:0 
  at Oxide.Plugins.ZoneManager.OnEntityKill (BaseEntity baseEntity) [0x00057] in <ad976e052948470e9408b30239852ed4>:0 
  at Oxide.Plugins.ZoneManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0037f] in <ad976e052948470e9408b30239852ed4>: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

Getting this error in RCON, not sure what causes it but it is being spammed constantly

Failed to call hook 'OnEntityKill' on plugin 'ZoneManager v3.0.8' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ZoneManager+Zone.OnEntityExitZone (BaseEntity baseEntity, System.Boolean resetDecay) [0x00000] in :0
  at Oxide.Plugins.ZoneManager.OnEntityKill (BaseEntity baseEntity) [0x00057] in :0
  at Oxide.Plugins.ZoneManager.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0037f] in :0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <41771c7bc8d246d0b0a34c2f0d27f2cb>: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​

I am getting this error everytime I add a zone, and it causes lag.

Guys..im reveing packet flooding as i start entering commands like /zone radius 40 undestr true