Link crash

Build version: 1.7.1
Build date: 1981-01-01 01:01:02
Current date: 2021-11-04 17:29:17
Device: Realme RMX2032
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$6.run(ANRequest.java:709)
    at android.os.Handler.handleCallback(Handler.java:899)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:238)
    at android.app.ActivityThread.main(ActivityThread.java:7853)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:984)

User actions:
2021-11-04 16:41:37: SplashScreen created
2021-11-04 16:41:38: SplashScreen resumed
2021-11-04 16:41:41: SplashScreen paused
2021-11-04 16:41:41: HomeScreen created
2021-11-04 16:41:41: HomeScreen resumed
2021-11-04 16:41:42: HomeScreen paused
2021-11-04 16:41:42: HomeScreen resumed
2021-11-04 16:41:42: SplashScreen destroyed
2021-11-04 16:41:52: HomeScreen paused
2021-11-04 16:41:52: ChatScreen created
2021-11-04 16:41:52: ChatScreen resumed
2021-11-04 16:44:36: ChatScreen paused
2021-11-04 16:59:09: ChatScreen resumed
2021-11-04 16:59:19: ChatScreen paused
2021-11-04 16:59:19: AlbumActivity created
2021-11-04 16:59:19: AlbumActivity resumed
2021-11-04 16:59:26: AlbumActivity paused
2021-11-04 16:59:26: ChatScreen resumed
2021-11-04 16:59:30: AlbumActivity destroyed
2021-11-04 17:00:00: ChatScreen paused
2021-11-04 17:00:17: ChatScreen resumed
2021-11-04 17:00:19: ChatScreen paused
2021-11-04 17:00:19: ChatScreen resumed
2021-11-04 17:00:28: ChatScreen paused
2021-11-04 17:00:28: AlbumActivity created
2021-11-04 17:00:29: AlbumActivity resumed
2021-11-04 17:00:31: AlbumActivity paused
2021-11-04 17:00:31: ChatScreen resumed
2021-11-04 17:00:33: AlbumActivity destroyed
2021-11-04 17:00:49: ChatScreen paused
2021-11-04 17:11:12: ChatScreen resumed
2021-11-04 17:11:18: ChatScreen paused
2021-11-04 17:11:18: AlbumActivity created
2021-11-04 17:11:18: AlbumActivity resumed
2021-11-04 17:11:21: AlbumActivity paused
2021-11-04 17:11:21: ChatScreen resumed
2021-11-04 17:11:28: AlbumActivity destroyed
2021-11-04 17:11:39: ChatScreen paused
2021-11-04 17:11:39: HomeScreen resumed
2021-11-04 17:11:40: ChatScreen destroyed
2021-11-04 17:11:41: HomeScreen paused
2021-11-04 17:12:07: HomeScreen resumed
2021-11-04 17:12:08: HomeScreen paused
2021-11-04 17:12:08: ChatScreen created
2021-11-04 17:12:08: ChatScreen resumed
2021-11-04 17:12:11: ChatScreen paused
2021-11-04 17:12:11: AlbumActivity created
2021-11-04 17:12:11: AlbumActivity resumed
2021-11-04 17:12:13: AlbumActivity paused
2021-11-04 17:12:13: GalleryActivity created
2021-11-04 17:12:13: GalleryActivity resumed
2021-11-04 17:12:16: GalleryActivity paused
2021-11-04 17:12:16: AlbumActivity resumed
2021-11-04 17:12:17: GalleryActivity destroyed
2021-11-04 17:12:18: AlbumActivity paused
2021-11-04 17:12:19: ChatScreen resumed
2021-11-04 17:12:22: AlbumActivity destroyed
2021-11-04 17:14:19: ChatScreen paused
2021-11-04 17:29:05: ChatScreen resumed
2021-11-04 17:29:08: ChatScreen paused
2021-11-04 17:29:08: ChatScreen resumed
2021-11-04 17:29:13: ChatScreen paused
2021-11-04 17:29:13: CallScreen created
2021-11-04 17:29:13: CallScreen resumed
2021-11-04 17:29:15: CallScreen paused
2021-11-04 17:29:16: CallScreen resumed