d3d11videosink: stack overflow

With a single sink, and gst_video_overlay_set_window_handle API used to display video in specified window, if I start, stop, start, and then stop the sink, I get a stack overflow in this method:

static LRESULT FAR PASCAL
sub_class_proc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  WNDPROC external_window_proc = GetProp (hWnd, EXTERNAL_PROC_PROP_NAME);
  GstD3D11Window *self =
      (GstD3D11Window *) GetProp (hWnd, D3D11_WINDOW_PROP_NAME);