Jitsi meet black screen and crash in release build in Native App Java

I am integrating jitsi meet in my android native java project, Jitsi meet SDK not working properly, it’s crashing in a release build even after addition of progaurd also.I have followed JITSI Meet App from Github & using same progaurd used there.
Using these codes of Java

Even timer of call is not showing properly. Blinks continuously & displays some time.