SPOILER

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 #Qg.#Pg.#tK()
   at #Qg.#Pg..ctor()
   at #Qg.#ok..ctor(Editor )
   at osu.GameModes.Edit.Editor.#i4()
   at osu.GameModes.Edit.Editor.#h4(Object , Keys , Boolean )
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at #xn.#5n.#njb(Keys , Boolean )
   at #xn.#5n.#ljb(Keys )
   at #sn.#do.#gkb(List`1 )
   at #sn.#do.#Teb()
   at #Lg.#Ng.#rs()
   at #tb.#zb.#8s()
   at #tb.#zb.#jt(Object , EventArgs )
   at #tb.#Db.#Dt()
   at #tb.#Tb.#Rv(Object , EventArgs )
   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(Int32 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 System.Windows.Forms.Application.Run(Form mainForm)
   at #tb.#Tb.Run()
   at #tb.#zb.Run()
   at #Lg.#mp.#Hyb(String , Boolean , Boolean )