Objects not being correctly disposed.

[ArtWDrahn]

Sometimes when closing the game we get an unhandled exception in MainForm.Tick when invoking Action. Unclear at this point what is calling the method.

Specifically this line of code:

        this.Invoke((Action)(() =>
        {
            canvas.Image = e.Frame;
        }));

Exception Data:
System.ObjectDisposedException was unhandled
HResult=-2146232798
Message=Cannot access a disposed object.
Object name: 'MainForm'.
Source=System.Windows.Forms
ObjectName=MainForm
StackTrace:
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
at System.Windows.Forms.Control.Invoke(Delegate method)
at OpenMario.MainForm.Tick(FrameEventArgs e) in d:\Dropbox\GitHub\OpenMario\OpenMario\MainForm.cs:line 41
at OpenMario.MainForm.<.ctor>b__0(Object o, FrameEventArgs e) in d:\Dropbox\GitHub\OpenMario\OpenMario\MainForm.cs:line 26
at OpenMario.Core.Engine.Engine.Tick() in d:\Dropbox\GitHub\OpenMario\OpenMario.Core\Engine\Engine.cs:line 86
at OpenMario.Core.Engine.Engine.ThreadRun() in d:\Dropbox\GitHub\OpenMario\OpenMario.Core\Engine\Engine.cs:line 51
at OpenMario.Core.Engine.Engine.b__1() in d:\Dropbox\GitHub\OpenMario\OpenMario.Core\Engine\Engine.cs:line 99
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: