Cron Hourly Error Email: /etc/cron.hourly/plesk-php-cleanuper

Hi
I am receiving CRON emails every hour like this:-
/etc/cron.hourly/plesk-php-cleanuper:
/usr/lib64/plesk-9.0/maxlifetime: line 16: [: Unable to start builtin modules: integer expression expected
/usr/lib64/plesk-9.0/maxlifetime: line 16: [: Unable to start builtin modules: integer expression expected

Apparently executing the below command in /etc/cron.hourly/plesk-php-cleanuper
[ -x /usr/lib64/plesk-9.0/maxlifetime ] && [ -d /var/lib/php/session ] &&...

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