Link crash

Build version: 1.7.1
Build date: 1981-01-01 01:01:02
Current date: 2021-09-30 18:53:47
Device: Samsung SM-A515F
OS version: Android 11 (SDK 30)

Stack trace:
java.lang.NullPointerException
    at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1019)
    at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1014)
    at com.civix.link.Libraries.JanusWithGoogle.meet.MeetingService.subscribe(MeetingService.java:119)
    at com.civix.link.Libraries.JanusWithGoogle.meet.MeetingClient.subscribe(MeetingClient.java:116)
    at com.civix.link.Screen.CallScreen.subscriberToUser(CallScreen.kt:1719)
    at com.civix.link.Screen.CallScreen$getMediaList$1.onSuccess(CallScreen.kt:1132)
    at com.civix.link.Network.ApiHelper$getData$1.onResponse(ApiHelper.kt:98)
    at com.androidnetworking.common.ANRequest.deliverSuccessResponse(ANRequest.java:727)
    at com.androidnetworking.common.ANRequest.access$6500(ANRequest.java:80)
    at com.androidnetworking.common.ANRequest$6.run(ANRequest.java:709)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:246)
    at android.app.ActivityThread.main(ActivityThread.java:8595)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

User actions:
2021-09-30 18:50:03: SplashScreen created
2021-09-30 18:50:07: SplashScreen resumed
2021-09-30 18:50:08: SplashScreen paused
2021-09-30 18:50:08: HomeScreen created
2021-09-30 18:50:09: HomeScreen resumed
2021-09-30 18:50:09: HomeScreen paused
2021-09-30 18:50:09: HomeScreen resumed
2021-09-30 18:50:09: SplashScreen destroyed
2021-09-30 18:50:10: HomeScreen paused
2021-09-30 18:50:32: HomeScreen resumed
2021-09-30 18:50:34: HomeScreen paused
2021-09-30 18:50:34: ChatScreen created
2021-09-30 18:50:34: ChatScreen resumed
2021-09-30 18:50:36: ChatScreen paused
2021-09-30 18:50:36: ChatScreen resumed
2021-09-30 18:50:39: ChatScreen paused
2021-09-30 18:50:39: CallScreen created
2021-09-30 18:50:39: CallScreen resumed
2021-09-30 18:50:40: CallScreen paused
2021-09-30 18:50:41: CallScreen resumed
2021-09-30 18:50:51: CallScreen paused
2021-09-30 18:50:51: ChatScreen resumed
2021-09-30 18:51:08: ChatScreen paused
2021-09-30 18:51:08: CallScreen resumed
2021-09-30 18:51:12: CallScreen paused
2021-09-30 18:51:12: ChatScreen resumed
2021-09-30 18:51:14: ChatScreen paused
2021-09-30 18:51:15: CallScreen resumed
2021-09-30 18:51:16: CallScreen paused
2021-09-30 18:51:16: ChatScreen resumed
2021-09-30 18:51:20: ChatScreen paused
2021-09-30 18:51:20: CallScreen resumed
2021-09-30 18:51:25: CallScreen paused
2021-09-30 18:51:26: ChatScreen resumed
2021-09-30 18:51:27: CallScreen destroyed
2021-09-30 18:51:30: ChatScreen paused
2021-09-30 18:51:31: ChatScreen resumed
2021-09-30 18:51:33: ChatScreen paused
2021-09-30 18:51:33: CallScreen created
2021-09-30 18:51:33: CallScreen resumed
2021-09-30 18:51:34: CallScreen paused
2021-09-30 18:51:35: CallScreen resumed
2021-09-30 18:53:33: CallScreen paused
2021-09-30 18:53:33: ChatScreen resumed
2021-09-30 18:53:34: CallScreen destroyed
2021-09-30 18:53:41: ChatScreen paused
2021-09-30 18:53:41: ChatScreen resumed
2021-09-30 18:53:44: ChatScreen paused
2021-09-30 18:53:44: CallScreen created
2021-09-30 18:53:44: CallScreen resumed
2021-09-30 18:53:45: CallScreen paused
2021-09-30 18:53:45: CallScreen resumed