I receiving this error:

Fatal error: Uncaught Error: Call to a member function toHtml() on boolean in ...

This is how my block is declared:


This is my block from where the error occurs:

 class Yireo_EmailTester_Block_Form extends Mage_Adminhtml_Block_Widget_Container

    protected function _toHtml()
        $this->setChild('check', $this->getCheckBlock());
        $rt = parent::_toHtml();
        return $rt;

    protected function getCheckBlock()
        return Mage::app()->getLayout()->createBlock('emailtester/form_check')->setId('check');
     //   return $this->getLayout()->createBlock('emailtester/form_check')->setId('check');

Whatever string I type instead of emailtester/form_check I still get this error message. Any idea what could cause this issue? thank you in advance for any idea

1 Answer 1


Somewhere in the code Magento tries to render the block by calling toHtml() on the block, which is a standard function for rendering Blocks in Magento. But your block isn't called properly, so it's boolean false which obviously does not have a method toHtml

  • This is block: emailtester/form_check. See my block declaration in the xml. I have the folder Form and my file Check.php . I put in the constructor from Check.php and echo 1; exit(). I didn't get it. I don't know what else should i check. thx :) Commented Jan 5, 2017 at 13:59
  • Have you added your block in the layout?
    – Jacques
    Commented Jan 5, 2017 at 14:03
  • I updated my post, could you pleas check it ? txh Commented Jan 6, 2017 at 9:11

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