iOS JitsiMeetSDK 6.2.3 crashes

After upgrading to newer version of JitsiMeetSDK to v 6.2.3, we started to face crashes after ending Jitsi meeting.
Steps to reproduce:

  1. Start Jitsi meeting than end it.
  2. Navigate to other app for short period, so the instance of our app is awaken
  3. Return back to our app - crash!.
    Looks like meeting is not completely cleared.
**libc++abi: terminating with uncaught exception of type NSException**

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Appname.AppDelegate window]: unrecognized selector sent to instance 0x282bd4fc0'

terminating with uncaught exception of type NSException

After downgrading - crashes disappeared, but the question is:
Do you know about this issue? Maybe you added some extra step - after leaving the meeting, that we missed?