Uncaught ArgumentCountError in com/core/notice/SGNoticeHandler.php

A maintenance script that includes wp-config.php causes this error.

<br />
<b>Fatal error</b>:  Uncaught ArgumentCountError: Too few arguments to function {closure}(), 4 passed and exactly 5 expected.
Stack trace:
#0 [internal function]: {closure}()
#1 [root]/wp/wp-content/plugins/backup/com/core/notice/SGNoticeHandler.php(96): strtolower()
#2 [root]/wp/wp-content/plugins/backup/com/core/notice/SGNoticeHandler.php(13): SGNoticeHandler->checkExpiredLicense()
#3 [root]/wp/wp-content/plugins/backup/com/core/SGBoot.php(46): SGNoticeHandler->run()
#4 [root]/wp/wp-content/plugins/backup/com/boot.php(6): SGBoot::init()
#5 [root]/wp/wp-content/plugins/backup/public/boot.php(2): require_once('...')
#6 [root]/wp/wp-content/plugins/backup/backup.php(35): require_once('...')
#7 [root]/wp/wp-settings.php(447): include_once('...')
#8 [root]/wp/wp-config.php(38): require_once('...')

Since SGConfig::get() may return null, a cast to string would solve this issue.

	private function checkExpiredLicense()
	{
		if (strtolower((string)SGConfig::get('SG_LICENSE_KEY_STATUS')) == JBWP_LICENSE_KEY_STATUS_EXPIRED) {
			SGNotice::getInstance()->addNoticeFromTemplate('expired_license_error', SG_NOTICE_ERROR, true);
		}
	}

Maybe you could consider adding this change. Thank you.