NullReferenceException at OnEntityTakeDamageError
00:31 [Error] Failed to call hook 'OnEntityTakeDamage' on plugin 'IndestructableBuildings v1.0.1' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.IndestructableBuildings.OnEntityTakeDamage (BaseCombatEntity entity, HitInfo info) [0x000ac] in <169de08958b045f8b5f5d4e2e3fffc57>:0 
  at Oxide.Plugins.IndestructableBuildings.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00142] in <169de08958b045f8b5f5d4e2e3fffc57>: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 
Failed to call hook 'OnEntityTakeDamage' on plugin 'IndestructableBuildings v1.0.1' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.IndestructableBuildings.OnEntityTakeDamage (BaseCombatEntity entity, HitInfo info) [0x000ac] in <c12ef16b988c4908992963afae969bff>:0
at Oxide.Plugins.IndestructableBuildings.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00142] in <c12ef16b988c4908992963afae969bff>: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
Sooo my a building on the server with this plugin got raided. does this mean they are hackers? or how is this possible? I tried dealing damage to another building just to try it out and I couldn't damage it.

Merged post

@Hellseek