Cronjob throws an error

Hello Everyone!
Just recently the cronjob started to throw this error.
I assume the database take more memory as acceptable. Is it normal? Or what causes it?

PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 12288 bytes) in /var/www/vhosts/ventaplaza.com/httpdocs/includes/classes/dbi.class.php on line 237


Any Idea?

I think you have too many categories or listings or something else and the system needs more memory limit. Please contact your hosting support to increase it.
Right now allow 128M ask to increase it to 512M.