White screen when no devices are allowed

Hi,
Sometimes, when an user has no devices allowed, a white screen appears instead of the videoconference one. The only way I could recreate the error was in the demo page. I followed the next steps

  1. Remove permission to camera and microphone
  2. Access a room
  3. The white screen appears.

I have tried with other laptop and it appears a message INPUT DEVICE NOT FOUND
I have also tried another type of videoconferencia like Google meets but it ask me for a device.
¿Could you help me with this?