Link crash

Build version: 1.7.8
Build date: 1981-01-01 01:01:02
Current date: 2021-12-24 14:29:38
Device: Samsung SM-A505F
OS version: Android 11 (SDK 30)

Stack trace:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.civix.link/com.civix.link.Screen.SingleCallScreen}: java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.lang.Iterable.iterator()' on a null object reference
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3800)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3976)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2315)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:246)
    at android.app.ActivityThread.main(ActivityThread.java:8550)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.lang.Iterable.iterator()' on a null object reference
    at com.civix.link.Screen.SingleCallScreen.defaultTurnServer(SingleCallScreen.kt:818)
    at com.civix.link.Screen.SingleCallScreen.startJanus(SingleCallScreen.kt:611)
    at com.civix.link.Screen.SingleCallScreen.onCreate(SingleCallScreen.kt:203)
    at android.app.Activity.performCreate(Activity.java:8198)
    at android.app.Activity.performCreate(Activity.java:8182)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3773)
    ... 11 more

User actions:
2021-12-24 14:28:55: SplashScreen created
2021-12-24 14:28:55: SplashScreen resumed
2021-12-24 14:28:56: SplashScreen paused
2021-12-24 14:28:56: HomeScreen created
2021-12-24 14:28:56: HomeScreen resumed
2021-12-24 14:28:57: SplashScreen destroyed
2021-12-24 14:28:58: HomeScreen paused
2021-12-24 14:28:58: ChatScreen created
2021-12-24 14:28:58: ChatScreen resumed
2021-12-24 14:29:32: ChatScreen paused
2021-12-24 14:29:32: CallingScreen created
2021-12-24 14:29:32: CallingScreen resumed
2021-12-24 14:29:37: CallingScreen paused
2021-12-24 14:29:37: SingleCallScreen created