Random error on start

I got into this once I clicked on view.
#!


Collection was modified; enumeration operation may not execute.

App:     LaunchBox
Version: 8.4-beta-15
Type:    System.InvalidOperationException
Site:    Void ThrowInvalidOperationException(System.ExceptionResource)
Source:  mscorlib

   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at (ItemsControl )
   at Unbroken.LaunchBox.Desktop.Next.ViewModels.SideBarViewModel.BuildViewMenu(ItemsControl viewMenuItem)
   at (MainViewModel , Object )
   at Unbroken.LaunchBox.Desktop.Next.ViewModels.MainViewModel.<ViewDropDown>b__228_0(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.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

Recent Log:

   3:23:09 AM Music.Prepare Start
   3:23:09 AM Music.Kill Start
   3:23:09 AM Music.Kill Finished
   3:23:09 AM Music.NotifyTrackList Start
   3:23:09 AM Music.NotifyTrackList Invoke
   3:23:15 AM Music.Play Start
   3:23:15 AM Music.Kill Start
   3:23:15 AM Music.Kill Finished
   3:23:15 AM Music.Play Empty Music Path
   3:23:15 AM Music.NotifyTrackList Start
   3:23:15 AM Music.NotifyTrackList Invoke
   3:23:15 AM Exception
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