wheezy php5 upgrade -- lots of cron emails

[Tad Bak <T.Bak@uws.edu.au>]

After the recent php5 security upgrade on wheezy (libapache2-mod-php5, php5-cli and php5-common) my cron started to generate a lot of e-mails:

From: Cron Daemon <root@...>
To: root@...
Subject: Cron <root@...>   [ -x /usr/lib/php5/maxlifetime ] && [ -x
        /usr/lib/php5/sessionclean ] && [ -d /var/lib/php5 ] &&
        /usr/lib/php5/sessionclean /var/lib/php5 $(/usr/lib/php5/maxlifetime)

sed: invalid option -- 'z'
Usage: sed [OPTION]... {script-only-if-no-other-script} [input-file]...
[...]

Has anybody experienced the same behavior? 

Thanks,
  Tad