PHP Fatal Error Memory Limit before migration

Hi there,

First of all, thank you for your help!
Im new in the forum and quite new with wordpress

My wp site is showing the folling error before a migration to a self configured ubuntu server.
“Fatal error: Allowed memory size of 134217728 bytes exhausted at /opt/phpfarm/src/php-5.3.27/Zend/zend_execute.c:920 (tried to allocate 64 bytes) in /var/www/vhosts/<site-name>/httpdocs/wp-includes/plugin.php on line 86”

Memory limit stablished in the php.ini file:
memory_limit = 128M

I have tryed what other similar issue recommend
– Add this line to the wp-config.php file: define(‘WP_MEMORY_LIMIT’, ‘128M’);

And also changed both configurations to 134MB, but shows another error with more memory limit 134217728 bytes.

Is there any other option to solve this memory problem or I have to increase it until the error stops displaying?

Thank you very much for your attention.