Failed to call hook 'OnUserConnected' on plugin 'PlaytimeTracker v0.2.2' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.PlaytimeTracker+StoredData+UserData.StartTimer () [0x0000b] in <48813e94c5f9448194e50da66680bb48>:0

  at Oxide.Plugins.PlaytimeTracker+StoredData+UserData.OnUserConnected (Oxide.Core.Libraries.Covalence.IPlayer user) [0x00030] in <48813e94c5f9448194e50da66680bb48>:0

  at Oxide.Plugins.PlaytimeTracker+StoredData.OnUserConnected (Oxide.Core.Libraries.Covalence.IPlayer user) [0x00032] in <48813e94c5f9448194e50da66680bb48>:0

  at Oxide.Plugins.PlaytimeTracker.OnUserConnected (Oxide.Core.Libraries.Covalence.IPlayer user) [0x00000] in <48813e94c5f9448194e50da66680bb48>:0

  at Oxide.Plugins.PlaytimeTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00114] in <48813e94c5f9448194e50da66680bb48>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <e23ba2c0f246426296d81c842cbda3af>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <50629aa0e75d4126b345d8d9d64da28d>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <50629aa0e75d4126b345d8d9d64da28d>:0

Why is this marked as solved? Issue is still here. 

Matt

Why is this marked as solved? Issue is still here. 

Assuming the user either accidentally marked it as such, or they solved it. It is likely due to corrupt data.