Unhandled exception when closing

[meshak]

Whenever I click the X button on the Pinta window or I go to the menu and click exit an error window shows up and says
Unhandled exception:
Exception has been thrown by the target of an invocation.

When I click details the window shows this : System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object
  at Pinta.Core.SettingsManager.Serialize (System.String filename, System.Collections.Generic.Dictionary`2 settings) [0x00000] in <filename unknown>:0
  at Pinta.Core.SettingsManager.SaveSettings () [0x00000] in <filename unknown>:0
  at Pinta.MainWindow.SaveUserSettings () [0x00000] in <filename unknown>:0
  at Pinta.MainWindow.<MainWindow>m__0 (System.Object , System.EventArgs ) [0x00000] in <filename unknown>:0
  at Pinta.Core.FileActions.RaiseBeforeQuit () [0x00000] in <filename unknown>:0
  at Pinta.Actions.ExitProgramAction.Activated (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
  --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in <filename unknown>:0
  at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0
  at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0
  at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000] in <filename unknown>:0

I can't find the process in the process manager. It's unclosable!

[grofaty (grofaty)]

I am not experiencing this kind of problem and I use Pinta 1.6 on Ubuntu 14.04 and Windows 7. Maybe this problem is your system specific. Can you please be so kind and provide more info.
1. What is your Pinta version (menu Help | About). If you are using some old version please install latest stable: www.pinta-project.com/releases
2. Also provide info what is your operating system and version.
3. Is this problem happening EVERY time? Like starting Pinta and closing it without any other action? If no, then we need exact step-by-step instructions how to trigger the crash.

[meshak (meshak-315)]

I use a Lenovo IdeaPad Flex 10 with Ubuntu 14.04 LTS. The exact step by step instructions to trigger the error are:
1.Open pinta
2.Click the open button
3.Select an image file
4.Draw on the image a little bit
5.Click file and then click exit OR click the X button.
6.Select any option in the save dialog but not cancel.
Those are the steps to trigger the error. My pinta version is 1.3. Is this enough?

[grofaty (grofaty)]

I use Pinta 1.6 on Ubuntu 14.04 LTS and I can't reproduce this problem. This is a bug in Pinta 1.3 or there is something specific in your system. I strongly suggest you to upgrade to Pinta 1.6, because it is way way way more stable then any previous version. See installation instructions: http://pinta-project.com/howto/installing-pinta

Please report back if problem is solved in Pinta 1.6.