Link crash

Build version: 1.7.1
Build date: 1981-01-01 01:01:02
Current date: 2021-09-24 09:23:34
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 09:21:06: SplashScreen created
2021-09-24 09:21:07: SplashScreen resumed
2021-09-24 09:21:08: SplashScreen paused
2021-09-24 09:21:08: HomeScreen created
2021-09-24 09:21:09: HomeScreen resumed
2021-09-24 09:21:09: HomeScreen paused
2021-09-24 09:21:09: HomeScreen resumed
2021-09-24 09:21:09: SplashScreen destroyed
2021-09-24 09:21:11: HomeScreen paused
2021-09-24 09:21:11: ChatScreen created
2021-09-24 09:21:11: ChatScreen resumed
2021-09-24 09:21:13: ChatScreen paused
2021-09-24 09:21:14: ChatScreen resumed
2021-09-24 09:21:16: ChatScreen paused
2021-09-24 09:21:16: CallScreen created
2021-09-24 09:21:16: CallScreen resumed
2021-09-24 09:21:17: CallScreen paused
2021-09-24 09:21:17: ChatScreen resumed
2021-09-24 09:21:17: CallScreen destroyed
2021-09-24 09:21:21: ChatScreen paused
2021-09-24 09:21:21: ChatScreen resumed
2021-09-24 09:21:24: ChatScreen paused
2021-09-24 09:21:24: CallScreen created
2021-09-24 09:21:24: CallScreen resumed
2021-09-24 09:21:24: CallScreen paused
2021-09-24 09:21:25: ChatScreen resumed
2021-09-24 09:21:25: CallScreen destroyed
2021-09-24 09:21:29: ChatScreen paused
2021-09-24 09:21:29: HomeScreen resumed
2021-09-24 09:21:29: HomeScreen paused
2021-09-24 09:21:30: HomeScreen destroyed
2021-09-24 09:21:30: ChatScreen destroyed
2021-09-24 09:21:37: SplashScreen created
2021-09-24 09:21:38: SplashScreen resumed
2021-09-24 09:21:39: SplashScreen paused
2021-09-24 09:21:39: HomeScreen created
2021-09-24 09:21:39: HomeScreen resumed
2021-09-24 09:21:39: HomeScreen paused
2021-09-24 09:21:40: HomeScreen resumed
2021-09-24 09:21:41: HomeScreen paused
2021-09-24 09:21:41: ChatScreen created
2021-09-24 09:21:42: ChatScreen resumed
2021-09-24 09:21:42: SplashScreen destroyed
2021-09-24 09:21:47: ChatScreen paused
2021-09-24 09:21:47: ChatScreen resumed
2021-09-24 09:21:49: ChatScreen paused
2021-09-24 09:21:50: CallScreen created
2021-09-24 09:21:50: CallScreen resumed
2021-09-24 09:21:51: CallScreen paused
2021-09-24 09:21:51: ChatScreen resumed
2021-09-24 09:21:52: CallScreen destroyed
2021-09-24 09:23:27: ChatScreen paused
2021-09-24 09:23:28: ChatScreen resumed
2021-09-24 09:23:30: ChatScreen paused
2021-09-24 09:23:30: CallScreen created
2021-09-24 09:23:30: CallScreen resumed
2021-09-24 09:23:32: CallScreen paused
2021-09-24 09:23:32: CallScreen resumed