Fatal Error in Button Block with PHP 8+ – $b[‘width’] Access on String

Hi,

We’ve run into a fatal error with the Button Block in the latest version of Ultimate Blocks when running on PHP 8+.

Error message:

Fatal error: Uncaught TypeError: Cannot access offset of type string on string in
/wp-content/plugins/ultimate-blocks/src/blocks/button/block.php:124

Code in question (line 124 of block.php):

$width_styles[‘width’] = Ultimate_Blocks\includes\spacing_preset_css_var($b[‘width’][‘all’]);

$b['width'] is sometimes stored as a string instead of an array (likely in older saved blocks or malformed block attributes).
PHP 8+ throws a fatal error when trying to access an array key (['all']) on a string.
This can happen with older posts/pages that contain Button Blocks created in earlier versions of Ultimate Blocks.

Proposed fix:
A simple type check prevents the fatal error:

if (
$buttonWidth === ‘fixed’ &&
!empty($b[‘width’]) &&
is_array($b[‘width’]) &&
isset($b[‘width’][‘all’])
) {
$width_styles[‘width’] = Ultimate_Blocks\includes\spacing_preset_css_var($b[‘width’][‘all’]);
}

Steps to reproduce:

1. Create a Button Block in an older version of Ultimate Blocks.
2. Update to the latest plugin version and run on PHP 8.1 or newer.
3. Load the page without re-saving the block in the editor.
4. Fatal error occurs.

Suggested resolution:

• Add the is_array() check before accessing $b['width']['all'] in ub_multi_buttons_parse() in block.php.
• Consider validating or normalizing $b['width'] when parsing saved block attributes.

This would make the block much more robust and backward-compatible with older saved content, preventing fatal errors in PHP 8+.