NullReferenceException at HideSleeperFixed

I'm never really sure if these errors are worth mentioning. But this one keeps spamming on server start.

Failed to call hook 'OnPlayerSleep' on plugin 'InvisibleSleepers v1.0.5' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.InvisibleSleepers.HideSleeper (BasePlayer player) [0x0009f] in <5047af434def40d7ba5654ef493e7cd1>:0 
  at Oxide.Plugins.InvisibleSleepers.OnPlayerSleep (BasePlayer player) [0x00034] in <5047af434def40d7ba5654ef493e7cd1>:0 
  at Oxide.Plugins.InvisibleSleepers.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x003f0] in <5047af434def40d7ba5654ef493e7cd1>: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
Thanks for informing, should be a simple fix.
Locked automatically