Link crash

Build version: 1.7.1
Build date: 1981-01-01 01:01:02
Current date: 2021-09-24 09:21:02
Device: Samsung SM-A750GN
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$6.run(ANRequest.java:709)
    at android.os.Handler.handleCallback(Handler.java:883)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:237)
    at android.app.ActivityThread.main(ActivityThread.java:7948)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)

User actions:
2021-09-24 08:30:33: SplashScreen created
2021-09-24 08:30:33: SplashScreen resumed
2021-09-24 08:30:35: SplashScreen paused
2021-09-24 08:30:35: HomeScreen created
2021-09-24 08:30:35: HomeScreen resumed
2021-09-24 08:30:35: HomeScreen paused
2021-09-24 08:30:36: HomeScreen resumed
2021-09-24 08:30:36: SplashScreen destroyed
2021-09-24 08:30:38: HomeScreen paused
2021-09-24 08:30:38: ChatScreen created
2021-09-24 08:30:38: ChatScreen resumed
2021-09-24 08:30:45: ChatScreen paused
2021-09-24 08:30:45: HomeScreen resumed
2021-09-24 08:30:45: HomeScreen paused
2021-09-24 08:30:46: ChatScreen destroyed
2021-09-24 08:33:27: SplashScreen created
2021-09-24 08:33:28: SplashScreen resumed
2021-09-24 08:33:29: SplashScreen paused
2021-09-24 08:33:29: HomeScreen created
2021-09-24 08:33:29: HomeScreen resumed
2021-09-24 08:33:29: HomeScreen paused
2021-09-24 08:33:29: HomeScreen resumed
2021-09-24 08:33:31: HomeScreen paused
2021-09-24 08:33:31: ChatScreen created
2021-09-24 08:33:31: ChatScreen resumed
2021-09-24 08:33:31: SplashScreen destroyed
2021-09-24 08:33:51: ChatScreen paused
2021-09-24 08:33:51: HomeScreen resumed
2021-09-24 08:33:57: HomeScreen paused
2021-09-24 08:33:57: HomeScreen resumed
2021-09-24 08:33:59: HomeScreen paused
2021-09-24 08:33:59: HomeScreen destroyed
2021-09-24 08:33:59: ChatScreen destroyed
2021-09-24 08:33:59: HomeScreen destroyed
2021-09-24 08:52:45: SplashScreen created
2021-09-24 08:52:45: SplashScreen resumed
2021-09-24 08:52:47: SplashScreen paused
2021-09-24 08:52:47: HomeScreen created
2021-09-24 08:52:47: HomeScreen resumed
2021-09-24 08:52:47: HomeScreen paused
2021-09-24 08:52:47: HomeScreen resumed
2021-09-24 08:52:50: HomeScreen paused
2021-09-24 08:52:50: ChatScreen created
2021-09-24 08:52:50: ChatScreen resumed
2021-09-24 08:52:50: SplashScreen destroyed
2021-09-24 08:52:53: ChatScreen paused
2021-09-24 08:52:53: ChatScreen resumed
2021-09-24 08:52:55: ChatScreen paused
2021-09-24 08:52:56: CallScreen created
2021-09-24 08:52:56: CallScreen resumed
2021-09-24 08:52:56: CallScreen paused
2021-09-24 08:52:57: CallScreen resumed
2021-09-24 08:55:35: CallScreen paused
2021-09-24 08:55:55: CallScreen resumed
2021-09-24 09:02:48: CallScreen paused
2021-09-24 09:04:45: CallScreen resumed
2021-09-24 09:04:49: CallScreen paused
2021-09-24 09:04:53: CallScreen resumed
2021-09-24 09:20:13: CallScreen paused
2021-09-24 09:20:14: CallScreen destroyed
2021-09-24 09:20:42: SplashScreen created
2021-09-24 09:20:43: SplashScreen resumed
2021-09-24 09:20:44: SplashScreen paused
2021-09-24 09:20:44: HomeScreen created
2021-09-24 09:20:44: HomeScreen resumed
2021-09-24 09:20:45: HomeScreen paused
2021-09-24 09:20:45: HomeScreen resumed
2021-09-24 09:20:46: HomeScreen paused
2021-09-24 09:20:47: ChatScreen created
2021-09-24 09:20:47: ChatScreen resumed
2021-09-24 09:20:47: SplashScreen destroyed
2021-09-24 09:20:49: ChatScreen paused
2021-09-24 09:20:50: ChatScreen resumed
2021-09-24 09:20:52: ChatScreen paused
2021-09-24 09:20:52: CallScreen created
2021-09-24 09:20:52: CallScreen resumed
2021-09-24 09:20:52: CallScreen paused
2021-09-24 09:20:52: ChatScreen resumed
2021-09-24 09:20:53: CallScreen destroyed
2021-09-24 09:20:57: ChatScreen paused
2021-09-24 09:20:57: ChatScreen resumed
2021-09-24 09:21:00: ChatScreen paused
2021-09-24 09:21:00: CallScreen created
2021-09-24 09:21:00: CallScreen resumed
2021-09-24 09:21:01: CallScreen paused