Android WebRTC Video Call Issue Resolution

I have a problem with my WebRTC/AppRTC app on Android. There is an error when I try to establish video calls. Even though, the app doesn't crash but it just fails to connect making the video calls impossible.
It must be easy to fix for experienced android developer.

The ideal candidate for this project will have:
- solid experience with AppRTC
- familiarity with WebRTC framework
- a successful track record of debugging and fixing issues in Android apps

Below is the error in logs. Also refer to screenshot:
Fatal error: Attempt to invoke virtual method 'javax.net.ssl.SSLSocketFactory javax.net.ssl.SSLContext.getSocketFactory()' on a null object reference

java.lang.NullPointerException: Attempt to invoke virtual method 'javax.net.ssl.SSLSocketFactory javax.net.ssl.SSLContext.getSocketFactory()' on a null object reference
at cloud.videocalls.livevideochat.util.AsyncHttpURLConnection.sendHttpMessage(AsyncHttpURLConnection.java:81)
at cloud.videocalls.livevideochat.util.AsyncHttpURLConnection.lambda$7S0n8ia4BNHvRki3Q9wH40LOgdU(Unknown Source:0)
at cloud.videocalls.livevideochat.util.-$$Lambda$AsyncHttpURLConnection$7S0n8ia4BNHvRki3Q9wH40LOgdU.run(Unknown Source:2)
at java.lang.Thread.run(Thread.java:1012)