On Plugin Unload nothing gets despawned

When unloading the plugin I get these errors and also nothing despawns

Failed to call hook 'Unload' on plugin 'ArmedDeployment v4.1.0' (NullReferenceException: Object reference not set to an instance of an object)
  at RpcTarget.NetworkGroup (System.String funcName, BaseNetworkable entity) [0x00010] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseMountable.DismountPlayer (BasePlayer player, System.Boolean lite) [0x0029b] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BasePlayer.EnsureDismounted () [0x0000e] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BasePlayer.OnDied (HitInfo info) [0x000e8] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at ScientistNPC.OnDied (HitInfo info) [0x00000] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseCombatEntity.Die (HitInfo info) [0x0008b] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BasePlayer.Die (HitInfo info) [0x000ce] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseCombatEntity.Hurt (HitInfo info) [0x002b8] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BasePlayer.Hurt (HitInfo info) [0x0047f] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at HumanNPC.Hurt (HitInfo info) [0x00018] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseCombatEntity.Hurt (System.Single amount, Rust.DamageType type, BaseEntity attacker, System.Boolean useProtection) [0x0002f] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at CH47HelicopterAIController.DismountAllPlayers () [0x00040] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseMountable.DoServerDestroy () [0x00000] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseHelicopter.DoServerDestroy () [0x00007] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at BaseNetworkable.DoEntityDestroy () [0x00026] in <34c1ecf46a7b410ca8dc7d76602da46f>:0 
  at (wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition.BaseNetworkable.Kill_Patch1(BaseNetworkable,BaseNetworkable/DestroyMode)
  at Oxide.Plugins.ArmedDeployment.Unload () [0x0016b] in <49247d1f58734238b09c7425a6820f21>:0 
  at Oxide.Plugins.ArmedDeployment.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000e2] in <49247d1f58734238b09c7425a6820f21>: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 <112d89ea5d3348c8b949af0ab1a866d2>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <112d89ea5d3348c8b949af0ab1a866d2>:0 
Unloaded plugin ArmedDeployment v4.1.0 by CodeBrothers