error 503 index prestashop

[cmanns]

Originally Posted by mistwang

if "bt" produce hundreds or thousands of entries like you posted, the php code causes stack over flow.

you can see an example at
http://ilia.ws/archives/5_Top_10_ways_to_crash_PHP.html

you need review PHP code or ask help from the people who wrote those PHP code.

by chance it could be Zend Optimizer? I've never had it play nice with my php installs, so I never installed it again

If you don't need Zend, disable it :-)

Also maybe try stracing the php process.