Link crash

Build version: 1.7.1
Build date: 1981-01-01 01:01:02
Current date: 2021-09-24 09:23:00
Device: HMD Global Nokia 5.4
OS version: Android 10 (SDK 29)

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$6.run(ANRequest.java:709)
    at android.os.Handler.handleCallback(Handler.java:883)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:214)
    at android.app.ActivityThread.main(ActivityThread.java:7397)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:935)

User actions:
2021-09-24 09:20:52: SplashScreen created
2021-09-24 09:20:52: SplashScreen resumed
2021-09-24 09:20:54: SplashScreen paused
2021-09-24 09:20:54: HomeScreen created
2021-09-24 09:20:54: HomeScreen resumed
2021-09-24 09:20:54: HomeScreen paused
2021-09-24 09:20:55: HomeScreen resumed
2021-09-24 09:20:56: HomeScreen paused
2021-09-24 09:20:56: ChatScreen created
2021-09-24 09:20:56: ChatScreen resumed
2021-09-24 09:20:56: SplashScreen destroyed
2021-09-24 09:20:59: ChatScreen paused
2021-09-24 09:21:00: ChatScreen resumed
2021-09-24 09:21:02: ChatScreen paused
2021-09-24 09:21:02: CallScreen created
2021-09-24 09:21:02: CallScreen resumed
2021-09-24 09:21:03: CallScreen paused
2021-09-24 09:21:03: ChatScreen resumed
2021-09-24 09:21:03: CallScreen destroyed
2021-09-24 09:21:43: ChatScreen paused
2021-09-24 09:21:44: ChatScreen resumed
2021-09-24 09:21:46: ChatScreen paused
2021-09-24 09:21:46: CallScreen created
2021-09-24 09:21:46: CallScreen resumed
2021-09-24 09:21:47: CallScreen paused
2021-09-24 09:21:47: ChatScreen resumed
2021-09-24 09:21:47: CallScreen destroyed
2021-09-24 09:22:16: ChatScreen paused
2021-09-24 09:22:16: ChatScreen resumed
2021-09-24 09:22:18: ChatScreen paused
2021-09-24 09:22:18: CallScreen created
2021-09-24 09:22:18: CallScreen resumed
2021-09-24 09:22:19: CallScreen paused
2021-09-24 09:22:19: ChatScreen resumed
2021-09-24 09:22:20: CallScreen destroyed
2021-09-24 09:22:30: ChatScreen paused
2021-09-24 09:22:30: ChatScreen resumed
2021-09-24 09:22:32: ChatScreen paused
2021-09-24 09:22:33: CallScreen created
2021-09-24 09:22:33: CallScreen resumed
2021-09-24 09:22:33: CallScreen paused
2021-09-24 09:22:33: ChatScreen resumed
2021-09-24 09:22:34: CallScreen destroyed
2021-09-24 09:22:55: ChatScreen paused
2021-09-24 09:22:55: ChatScreen resumed
2021-09-24 09:22:58: ChatScreen paused
2021-09-24 09:22:58: CallScreen created
2021-09-24 09:22:58: CallScreen resumed
2021-09-24 09:22:59: CallScreen paused
2021-09-24 09:22:59: CallScreen resumed