GStreamer plugin, in QCamera. CameraBin error: "Internal data flow error."

Hello!
When I use QCamera and USB Web camera, and if there are any delays in the main thread (the GUI thread). I have this message in the console, and stop the video playback.
CameraBin error: "Internal data flow error."

There is no call any slots, not caused stateChanged, statusChanged, QCamera :: Error (QCamera :: error). Ie, there is no way to handle this situation, and start the camera again. The situation occurs 1 minute after loading Unity, if the program is started, also when the GUI thread has some delay for more than 1 second, also when entering or exiting the Suspend mode.
In code this point:
/plugin/gstreamer/camerabin/camerabinsession.cpp:

Bool CameraBinSession :: processBusMessage (const QGstreamerMessage & message)
{
GstMessage * gm = message.rawMessage ();

If (gm) {
If (GST_MESSAGE_TYPE (gm) == GST_MESSAGE_ERROR) {
GError * err;
Gchar * debug;
Gst_message_parse_error (gm, & err, & debug);

QString message;

If (err && err-> message)

{ Message = QString :: fromUtf8 (err-> message); QWarning () << "CameraBin error:" << message; }

// !!! Actually, this condition is not fulfilled, as a result of which an error is not set:
// only report error messager from camerabin
If (GST_MESSAGE_SRC (gm) == GST_OBJECT_CAST (m_camerabin))

{ If (message.isEmpty ()) Message = tr ("Camera error"); SetError (int (QMediaRecorder :: ResourceError), message); }