Link crash

Build version: 1.7.8
Build date: 1981-01-01 01:01:02
Current date: 2021-12-31 17:58:09
Device: Samsung SM-G610F
OS version: Android 8.1.0 (SDK 27)

Stack trace:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Activity.startIntentSenderForResult(android.content.IntentSender, int, android.content.Intent, int, int, int, android.os.Bundle)' on a null object reference
    at com.google.android.play.core.appupdate.d.startIntentSenderForResult(Unknown Source:9)
    at com.google.android.play.core.appupdate.e.startUpdateFlowForResult(Unknown Source:23)
    at com.google.android.play.core.appupdate.e.startUpdateFlowForResult(Unknown Source:9)
    at com.sanojpunchihewa.updatemanager.UpdateManager.startUpdate(UpdateManager.java:95)
    at com.sanojpunchihewa.updatemanager.UpdateManager.access$100(UpdateManager.java:26)
    at com.sanojpunchihewa.updatemanager.UpdateManager$1.onSuccess(UpdateManager.java:84)
    at com.sanojpunchihewa.updatemanager.UpdateManager$1.onSuccess(UpdateManager.java:77)
    at com.google.android.play.core.tasks.e.run(Unknown Source:27)
    at android.os.Handler.handleCallback(Handler.java:790)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:7000)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)

User actions:
2021-12-31 16:58:27: ChatScreen created
2021-12-31 16:58:28: ChatScreen resumed
2021-12-31 16:59:06: ChatScreen paused
2021-12-31 16:59:08: ChatScreen resumed
2021-12-31 16:59:08: ChatScreen paused
2021-12-31 17:20:23: ChatScreen resumed
2021-12-31 17:20:25: ChatScreen paused
2021-12-31 17:20:25: HomeScreen created
2021-12-31 17:20:26: HomeScreen resumed
2021-12-31 17:20:27: ChatScreen destroyed
2021-12-31 17:20:27: HomeScreen paused
2021-12-31 17:20:28: HomeScreen resumed
2021-12-31 17:20:30: HomeScreen paused
2021-12-31 17:20:31: HomeScreen destroyed
2021-12-31 17:58:05: SplashScreen created
2021-12-31 17:58:05: SplashScreen resumed
2021-12-31 17:58:06: SplashScreen paused
2021-12-31 17:58:06: HomeScreen created
2021-12-31 17:58:06: HomeScreen resumed
2021-12-31 17:58:07: SplashScreen destroyed