Link crash

Build version: 1.7.1
Build date: 1981-01-01 01:01:02
Current date: 2021-09-24 09:20:27
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 08:56:46: SplashScreen created
2021-09-24 08:56:46: SplashScreen resumed
2021-09-24 08:56:48: SplashScreen paused
2021-09-24 08:56:48: HomeScreen created
2021-09-24 08:56:49: HomeScreen resumed
2021-09-24 08:56:49: HomeScreen paused
2021-09-24 08:56:49: HomeScreen resumed
2021-09-24 08:56:51: HomeScreen paused
2021-09-24 08:56:51: ChatScreen created
2021-09-24 08:56:51: ChatScreen resumed
2021-09-24 08:56:51: SplashScreen destroyed
2021-09-24 08:56:54: ChatScreen paused
2021-09-24 08:56:54: ChatScreen resumed
2021-09-24 08:57:01: ChatScreen paused
2021-09-24 08:57:01: CallScreen created
2021-09-24 08:57:01: CallScreen resumed
2021-09-24 08:57:02: CallScreen paused
2021-09-24 08:57:02: CallScreen resumed
2021-09-24 08:57:26: CallScreen paused
2021-09-24 08:57:40: CallScreen resumed
2021-09-24 08:57:41: CallScreen paused
2021-09-24 08:57:45: CallScreen resumed
2021-09-24 09:20:11: CallScreen paused
2021-09-24 09:20:12: CallScreen destroyed
2021-09-24 09:20:16: ChatScreen resumed
2021-09-24 09:20:21: ChatScreen paused
2021-09-24 09:20:22: ChatScreen resumed
2021-09-24 09:20:24: ChatScreen paused
2021-09-24 09:20:24: CallScreen created
2021-09-24 09:20:24: CallScreen resumed
2021-09-24 09:20:25: CallScreen paused
2021-09-24 09:20:25: CallScreen resumed