Link crash

Build version: 1.8.3.1
Build date: 1981-01-01 01:01:02
Current date: 2022-05-19 13:32:47
Device: OPPO CPH2239
OS version: Android 11 (SDK 30)

Stack trace:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.civix.link/com.civix.link.Screen.ReceivingFileScreen}: java.lang.NullPointerException
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3763)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3931)
    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$H.handleMessage(ActivityThread.java:2356)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:264)
    at android.app.ActivityThread.main(ActivityThread.java:8315)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)
Caused by: java.lang.NullPointerException
    at com.civix.link.Screen.ReceivingFileScreen.getRoomList(ReceivingFileScreen.kt:307)
    at com.civix.link.Screen.ReceivingFileScreen$initLayout$3.onRefresh(ReceivingFileScreen.kt:295)
    at com.jcodecraeer.xrecyclerview.XRecyclerView.refresh(XRecyclerView.java:274)
    at com.civix.link.Screen.ReceivingFileScreen.initLayout(ReceivingFileScreen.kt:302)
    at com.civix.link.Screen.ReceivingFileScreen.onCreate(ReceivingFileScreen.kt:194)
    at android.app.Activity.performCreate(Activity.java:8151)
    at android.app.Activity.performCreate(Activity.java:8135)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3732)
    ... 11 more

User actions:
2022-05-19 13:32:46: ReceivingFileScreen created