I disabled logging from the System > Advanced > Developer screen (I've checked that is disabled for all the websites/stores/storeviews) but Magento continues to write errors inside "/var/log/system.log" like:

[...] ERR (3): Warning: simplexml_load_string(): [...] in /lib/Varien/Simplexml/Config.php on line 383

Are there errors that ignore the admin backend setting?

  • Can you read from which module this log comes? Jan 20, 2016 at 17:27

3 Answers 3


In app/Mage.php method log():

    if (!self::$_isDeveloperMode && !$logActive && !$forceLog) {

A log will be written if the system is in developer mode, or the log is active, or the $forceLog parameter is true.

Since you say logging is disabled, and since the error handler does not force logging (as defined in app/code/core/Mage/Core/functions.php::mageCoreErrorHandler()), your store most likely has developer mode enabled. Check your .htaccess and index.php files for anything that might be triggering that.

  • Developer mode looks disabled, I added a check in site footer "echo Mage::getIsDeveloperMode() ? 'Y' : 'N';" and it returns N (if I enable the developer mode from index.php the check returns Y, so the check is working)
    – Riccardo
    Feb 4, 2016 at 14:58

I guess there is an Mage::log() call with param $forceLog = true:

    public static function log($message, $level = null, $file = '', $forceLog = false)

I have found that there was an extension with invalid xml data in one of its files, specifically a tag starting with a number.


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