Exception at Accepting_HandlePositionEvent

Hi,

I am getting an exception "Object reference not set to an instance of an
object" in my C# Application:

"at System.Windows.Forms.X11Dnd.Accepting_HandlePositionEvent
(System.Windows.Forms.XEvent& xevent) [0x00000] in <filename unknown>:0
  at System.Windows.Forms.X11Dnd.HandleClientMessage
(System.Windows.Forms.XEvent& xevent) [0x00000] in <filename unknown>:0
  at System.Windows.Forms.XplatUIX11.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr handle, Int32 wFilterMin, Int32
wFilterMax) [0x
00000] in <filename unknown>:0
  at System.Windows.Forms.XplatUI.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr hWnd, Int32 wFilterMin, Int32
wFilterMax) [0x00000
] in <filename unknown>:0
  at System.Windows.Forms.Application.RunLoop (Boolean Modal,
System.Windows.Forms.ApplicationContext context) [0x00000] in <filename
unknown>:0
  at System.Windows.Forms.Application.Run
(System.Windows.Forms.ApplicationContext context) [0x00000] in <filename
unknown>:0
  at System.Windows.Forms.Application.Run (System.Windows.Forms.Form
mainForm) [0x00000] in <filename unknown>:0"

Please let me know what could be the root cause of this issue. 
I'm using mono 2.6.4 on Linux.

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