Text 'null' could not be parsed at index 0 error

Question

i used threeten and Google Play console says my code only occurs in Samsung s9 and s20. here is my error and my code

Error Message

org.threeten.bp.format.DateTimeParseException: Text 'null' could not be parsed at index 0

FATAL EXCEPTION: Thread-3
Process: com.playhead.timbre, PID: 20573
org.threeten.bp.format.DateTimeParseException: Text 'null' could not be parsed at index 0
    at org.threeten.bp.format.DateTimeFormatter.parseToBuilder(DateTimeFormatter.java:1588)
    at org.threeten.bp.format.DateTimeFormatter.parse(DateTimeFormatter.java:1491)
    at org.threeten.bp.LocalDateTime.parse(LocalDateTime.java:444)
    at com.playhead.timbre.Function.localTime(Function.java:581)
    at com.playhead.timbre.Feed.Feed_Main.TimeOutRefresh(Feed_Main.java:229)
    at com.playhead.timbre.Feed.Feed_Frame.onHiddenChanged(Feed_Frame.java:91)
    at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:374)
    at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189)
    at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2100)
    at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002)
    at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:524)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)

My Code [Function.Class]

    public static boolean localTime(String timeout){ //timeout = "2022-02-20 18:20:36"

            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
            LocalDateTime serverDate = LocalDateTime.parse(timeout, formatter);  //<< Function.java:581
            org.threeten.bp.LocalDateTime localDate = org.threeten.bp.LocalDateTime.now();

            Log.e("LocalTime", "server:" + serverDate + " local:" + localDate);

            return localDate.isAfter(serverDate);

    }