After installing "sphinx search ultimate", when I goto the config page and select the "sphinx search" panel, I get the following error:

Fatal error: Call to a member function toOptionArray() on a non-object in ../app/code/core/Mage/Adminhtml/Block/System/Config/Form.php on line 464

I've tried some of the tips mentioned on the site here, including ensuring compilation is off.. but no luck.

Can someone help? Have you ever seen this issue when installing a new extension? Ideas on how to troubleshoot?


2 Answers 2


Make sure that all the files are installed, and web server has enough privileges to actually load them. This could easily happens if install requires several steps. toOptionArray is a method from object that populates drop-down options. Referring to it as a non-object means that the object value is null, which usually happens when declaration file is either missing or not readable.

  • thanks. In the end, the extension makers sorted it out for me. Did seems to be a bad install or something.
    – egg
    Commented Jul 21, 2014 at 17:49

copy app\code\core\Mage\Adminhtml\Block\System\Config\Form.php

paste / extend to / create app\code\local\Mage\Adminhtml\Block\System\Config\Form.php

find the following on line 463

$optionArray = $sourceModel->toOptionArray($fieldType == 'multiselect');

and replace it with:

   $optionArray = $sourceModel->toOptionArray($fieldType == 'multiselect');
} else {
  • It's a bad practices to modifiy the core.
    – Nolwennig
    Commented Jan 19, 2016 at 14:11
  • Hi @Nolwennig just paste / extend to / create app\code\local\Mage\Adminhtml\Block\System\Config\Form.php Commented Jul 19, 2016 at 4:10
  • Helps to get the issue. Thanks for the trick. Commented May 25, 2017 at 6:20

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