NullReferenceException at AddTimeError

playtimeTracker is not working is this due to the update really stund me not having that 

also the PlaceholderAPI isnt working is anyone able to help on these or comferm that they are not working?

Failed to call hook 'OnUserConnected' on plugin 'PlaytimeTracker v0.1.7' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.PlaytimeTracker.AddTime (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00040] in <05e41084cdbc4f4e8a76f75bd87b3a05>:0
  at Oxide.Plugins.PlaytimeTracker.ResetTimer (Oxide.Core.Libraries.Covalence.IPlayer player, System.Boolean isNew) [0x00014] in <05e41084cdbc4f4e8a76f75bd87b3a05>:0
  at Oxide.Plugins.PlaytimeTracker.InitPlayerData (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00044] in <05e41084cdbc4f4e8a76f75bd87b3a05>:0
  at Oxide.Plugins.PlaytimeTracker.OnUserConnected (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00000] in <05e41084cdbc4f4e8a76f75bd87b3a05>:0
  at Oxide.Plugins.PlaytimeTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0018f] in <05e41084cdbc4f4e8a76f75bd87b3a05>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in :0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0
Wait on plugin update...
people are saying it works 
so is it because i never updated or server glitchged in update 
Playtime tracker working fine for me same version.
Failed to call hook 'OnUserDisconnected' on plugin 'PlaytimeTracker 
v0.1.7' (NullReferenceException: Object reference not set to an instance of an object) at Oxide.Plugins.PlaytimeTracker.AddTime 
(Oxide.Core.Libraries.Covalence.IPlayer player) [0x00040] in :0
  at Oxide.Plugins.PlaytimeTracker.OnUserDisconnected (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00054] in :0
  at Oxide.Plugins.PlaytimeTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001bd] in :0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <80b90e8213db44b29ec2d4111764172c>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0
Failed to call hook 'OnUserConnected' on plugin 'PlaytimeTracker v0.1.7' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.PlaytimeTracker.AddTime (Oxide.Core.Libraries.Covalence.IPlayer player) [0x0004b] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.PlaytimeTracker.ResetTimer (Oxide.Core.Libraries.Covalence.IPlayer player, System.Boolean isNew) [0x00014] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.PlaytimeTracker.InitPlayerData (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00044] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.PlaytimeTracker.OnUserConnected (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00000] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.PlaytimeTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0018f] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <31122a27a2414cd799150f8677cf39d4>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <0fbce81d88d64454b3e7abb24df7026b>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <0fbce81d88d64454b3e7abb24df7026b>:0

Failed to call hook 'OnUserDisconnected' on plugin 'PlaytimeTracker v0.1.7' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.PlaytimeTracker.AddTime (Oxide.Core.Libraries.Covalence.IPlayer player) [0x0004b] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.PlaytimeTracker.OnUserDisconnected (Oxide.Core.Libraries.Covalence.IPlayer player) [0x00054] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.PlaytimeTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001bd] in <727703ab68ae4d20a0b4f5d0a62f0482>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <31122a27a2414cd799150f8677cf39d4>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <0fbce81d88d64454b3e7abb24df7026b>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <0fbce81d88d64454b3e7abb24df7026b>:0