($SESSION->session_test) value becomes null

($SESSION->session_test) value becomes null

by sujeet kumar -
Number of replies: 0

/// now do a session test to prevent random user switching - observed on some PHP/Apache combinations,
/// disable checks when working in cookieless mode


if (empty($CFG->usesid) || !empty($_COOKIE['MoodleSession'.$CFG->sessioncookie])) {
if ($SESSION != NULL) {
if (empty($_COOKIE['MoodleSessionTest'.$CFG->sessioncookie])) {
report_session_error();
} else if (isset($SESSION->session_test) && $_COOKIE['MoodleSessionTest'.$CFG->sessioncookie] != $SESSION->session_test){
report_session_error();
}
}
}

in lib-->setup.php at  else part in given code $SESSION->session_test value becomes null .guide me what can be the problem

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