ERROR "CanMountEntity"

Good morning,
Tell me, when I start my server I have errors of this style that appear. The server works but I would like to know where it comes from.

[Error] Failed to call hook 'CanMountEntity' on plugin 'Horses v1.0.18' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Horses.CanMountEntity (BasePlayer player, BaseMountable mountable) [0x00000] in <4b3e1ba1fb6a4c80a25dd7a12c6deb5e>:0 
  at Oxide.Plugins.Horses.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0053a] in <4b3e1ba1fb6a4c80a25dd7a12c6deb5e>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <d431e37658ba4727b7490299d12dfc44>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd1eb84be3b>:0

Changed Status from Pending to Closed

Changed Fixed In to 1.0.19

Thank you !!

Still getting this error:
 

Failed to call hook 'CanMountEntity' on plugin 'Horses v1.0.19' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Horses.CanMountEntity (BasePlayer player, BaseMountable mountable) [0x00000] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.Horses.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0053a] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
Failed to call hook 'OnEntityMounted' on plugin 'Horses v1.0.19' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Horses.OnEntityMounted (BaseMountable mountable, BasePlayer player) [0x0001a] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.Horses.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0044c] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
Failed to call hook 'OnEntityDismounted' on plugin 'CustomButtons v2.0.6' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.CustomButtons.CreatePartialCui (BasePlayer player, System.Collections.Generic.List`1[T] list) [0x00000] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.CustomButtons.OnEntityDismounted (ComputerStation entity, BasePlayer player) [0x00012] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.CustomButtons.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00ef8] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd1eb84be3b>:0 
        done.
Enforcing SpawnPopulation Limits
        done.
Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.IQParachute+<OnEntityDismounted>c__AnonStorey3.<>m__0 () [0x00055] in <585af271d12344bdae29b413cc3217f0>:0 
  at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <157a94ee66ab4a7991faecd1eb84be3b>:0