error code while attemping to edit second genre to metadata

[andrew]

MusicBee v3.1.6420.28372 (Win10.0), 28 Aug 2017 17:11:

System.ArgumentOutOfRangeException: Index must be within the bounds of the List.
Parameter name: index
   at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   at System.Collections.Generic.List`1.Insert(Int32 index, T item)
   at #=qzxr6mm_lMlQaaOdSKDnhOkNexPydkFEfjrej3mi3bP4=.#=qi_jegHjAhz$0tv4bXu_eZmII7HxySuJydHqrF0KBjsE=(Object #=qTN7ovLquef53JpBAszj03A==, EventArgs #=qbuAFKACycfnl35$7wxVsvg==)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at #=qGuPsoic4d4z0zyawuh6qHzG8LCqwHivQZxqhexq3A50=.OnClick(EventArgs #=q5uad0X2B59TuOUcq66Iiow==)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

[Steven]

that was reported recently and fixed:
http://musicbee.niblseed.com/V3_1/MusicBee31_Patched.zip

unzip and replace the existing musicbee application files