Magento 1.9.3.1 - Error 500 on products in cart if updated in admin

[ShapesGS]

Hello,

I'm running Magento 1.9.3.1 and I'm having a very weird issue I never encountered having multiple Magento websites.

If I add a product to cart then update it in back office, I have an error 500 on frontend on all pages. I have to delete browser history to get the pages back.

Any idea on what could be causing this ? Could it be a Magento bug ?

Logs are giving :

mod_fcgid: stderr: PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 130968 bytes) in /var/www/vhosts/domain.com/httpdocs/app/code/core/Mage/Sales/Model/Resource/Quote/Item/Option/Collection.php on line 101 on home page

mod_fcgid: stderr: PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 2245 bytes) in /var/www/vhosts/domain.com/httpdocs/app/code/local/Mage/Eav/Model/Entity/Collection/Abstract.php on line 1138 on category page

mod_fcgid: stderr: PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 98 bytes) in /var/www/vhosts/domain.com/httpdocs/lib/Zend/Db/Statement/Pdo.php on line 291 on product page

mod_fcgid: stderr: PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 256 bytes) in /var/www/vhosts/lescabinesblanches.com/httpdocs/lib/Varien/Simplexml/Element.php on line 195 on cart page

I'm on a dedicated server running multiple Magento stores OK.

I tried to follow https://techjam.gr/2012/magento/solve-magento-500-internal-server-errors/ and everything seems OK.

I also tried to switch off added extensions and turn default theme on.

Hoping for answers,

Best regards,

David

[ShapesGS]

With some help on Stack Exchange I tried to disable 3rd Party extensions in app/etc/modules folder.

It seems like J2T Design reward points is causing this issue.

I will post when issue gets fixed.

[Pronto]

256MB memory limit is kind of rock bottom -- Magento works, but just barely and once you start adding extensions the probability that it will run out of memory will increase. Magento officially recommends to use 512MB memory limit.