18:55 [Error] Failed to call hook 'OnPlayerSleepEnded' on plugin 'ProximityAlert v0.3.6' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ProximityAlert.OnPlayerSleepEnded (BasePlayer player) [0x00007] in <b79af18f55414306a73427696b4ca438>:0
  at Oxide.Plugins.ProximityAlert.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001b7] in <b79af18f55414306a73427696b4ca438>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <3606d2af539c45e4b5c61658e6a8b307>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0

this is since the latest Rust update.

Haven't been getting this error on my server. Are you still getting it ?

hey there - yes I just confirmed that I am still seeing the stack trace in the log:

04:06 [Error] Failed to call hook 'OnPlayerSleepEnded' on plugin 'ProximityAlert v0.3.6' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ProximityAlert.OnPlayerSleepEnded (BasePlayer player) [0x00007] in <ec22910feb5a442da76f9d4cc1f46fa1>:0

  at Oxide.Plugins.ProximityAlert.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001b7] in <ec22910feb5a442da76f9d4cc1f46fa1>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <3606d2af539c45e4b5c61658e6a8b307>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <c2afd8354b8b4f3ca451cf5a1aa111c3>:0