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Blank screen with server error 500

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My Prestashop site was running well for several months without any change and sudenly stoped with a blank page and a "server error 500" message. This does not help much. Restoring the full site and database did not change, no more than upgrading to a newer version.

However the backoffice worked.

It took me several hours to find how to display errors: just change two lines in the config.inc.php file (in config directory).

Replace

@ini_set('display_errors', 'off');

define('_PS_DEBUG_SQL_', false);

With

@ini_set('display_errors', 'on');

define('_PS_DEBUG_SQL_', true);

 

So you can see errors found before the server stops.

May be this is written somewhere but I did not find it.

 

I suggest to dev team to add a function to change those values from the backoffice so it would be easier to fix problems. (may be it exists and I did not find it)

 

In my case the reason was a small module accessing an external ressource not anymore available.

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and what with security ? debug mode should be only for developers, so actual solution is ok

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