When i open 'customer configuration' from the system configuration, I got the fatal error:

Warning: Illegal string offset 'value' in httpdocs/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field.php on line 111

This fatal error only appears when i select a website value different than 'default config'.

  • Have you solved this? – karstenm Sep 6 '17 at 9:21

This appears to be an issue with PHP 5.4+

You should NEVER rewrite core files unless absolutely necessary.

  1. Create a new file:


  2. Copy contents from

    app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field.php to app/code/local/Mage/Adminhtml/Block/System/Config/Form/Field.php

  3. Replace line 111 with the following: } elseif ((isset($v['value'])) && ($v['value']==$defText)) {

This should correct your error.


It's not about PHP version but Magento itself. For sure it has been FIXED in, maybe even earlier :) It looks like this:

if ($options) {
  $defTextArr = array();
  foreach ($options as $k=>$v) {
    if ($isMultiple) {
        if (is_array($v['value']) && in_array($k, $v['value'])) {
            $defTextArr[] = $v['label'];
    } elseif (isset($v['value'])) {
        if ($v['value'] == $defText) {
            $defTextArr[] = $v['label'];
    } elseif (!is_array($v)) {
        if ($k == $defText) {
            $defTextArr[] = $v;
  $defText = join(', ', $defTextArr);

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