NullReferenceException upon load

Failed to call hook 'OnServerInitialized' on plugin 'BetterNpc v2.3.0' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BetterNpc.OnServerInitialized () [0x000a4] in <2234d34bde7b4e3eb68ad0c8771678f4>:0 
  at Oxide.Plugins.BetterNpc.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001fa] in <2234d34bde7b4e3eb68ad0c8771678f4>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <15f61ddda771464d8246ebdce8ff4811>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <15f61ddda771464d8246ebdce8ff4811>:0 

1 hour ago, Terceran said:

Failed to call hook 'OnServerInitialized' on plugin 'BetterNpc v2.3.0' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BetterNpc.OnServerInitialized () [0x000a4] in <2234d34bde7b4e3eb68ad0c8771678f4>:0 
  at Oxide.Plugins.BetterNpc.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001fa] in <2234d34bde7b4e3eb68ad0c8771678f4>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <15f61ddda771464d8246ebdce8ff4811>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <15f61ddda771464d8246ebdce8ff4811>:0 

Hello, does the error occur every time the plugin is reloaded, or was it only once during the update? If it occurs every time the plugin is reloaded, please provide the exact sequence of actions, because I can’t reproduce it
oxide or carbon?
procedural or custom map?

Oxide, procedural map. It did it when I updated versions, but I noticed it's not doing it now when I reload. 

4 minutes ago, Terceran said:

Oxide, procedural map. It did it when I updated versions, but I noticed it's not doing it now when I reload. 

Then I’ll assume it’s related to updating the plugin on the fly; I think few people manually unload the previous version before loading the new one, right?

It happened on both of my servers, and I didn't manually unload. It overwrote the .cs file and it auto-loaded and threw the exception in both cases.

Actually, I’m doing the same thing, and I think this is the cause of this error, since there are no errors on a second reboot, and everything works fine for people when they restart the server. Why did this error occur specifically with this update? Probably because some new relationships between plugins appeared in the OnServerInitialized method.

Yes, I know the navmesh stuff just changed heavily, so anything is possible. It seems to be a temporary error and has no known lasting effects, so I'm fine with leaving it be. I'll let you know if I ever see it again.