DTXManiaNX Crashes when changing PlaySpeed

[basharkey]

Description

I have found a really weird issue where DTXManiaNX crashes when increasing or reducing PlaySpeed. The issue only occurs when:

1. PlaySpeed is any value other than 1.000
2. The SD binding under [DrumsKeyAssing] in Config.ini contains the Midi key M038 (it also seems crash if its M039)
3. And you successfully complete a stage (it won't crash if you get Stage Failed)

I was completely wrong, the game appears to crash when completing a song on modified PlaySpeed only if you haven't completed a simfile at 1.000 PlaySpeed first.

Crash details

System.NullReferenceException: Object reference not set to an instance of an object.
   at DTXMania.CActResultParameterPanel.OnUpdateAndDraw()
   at DTXMania.CStageResult.OnUpdateAndDraw()
   at DTXMania.CDTXMania.Draw(GameTime gameTime)
   at SampleFramework.Game.DrawFrame()
   at SampleFramework.Game.Tick()
   at SampleFramework.Game.Application_Idle(Object sender, EventArgs e)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at SampleFramework.Game.Run()
   at DTXMania.Program.Main()

Work Around

I was able to work around this by changing the Midi note my drum module outputs for its snare to 59. Then I replaced M038 with M059 and it no longer crashes.

First complete a simfile without failing at 1.000 PlaySpeed, then you can play any further songs at whatever PlaySpeed you prefer and the game won't crash.