Using null as an array offset is deprecated, use an empty string instead in Drupal\webform\Element\WebformHtmlEditor::processTextFormat() [#3619716]

Problem/Motivation

On PHP 8.5 deprecation warning is triggered in Drupal\webform\Element\WebformHtmlEditor

Deprecated function: Using null as an array offset is deprecated, use an empty string instead in Drupal\webform\Element\WebformHtmlEditor::processTextFormat() (line 304 of /var/www/html/web/modules/contrib/webform/src/Element/WebformHtmlEditor.php).

$element['format']['format']['#default_value'] could have a NULL value.
Using NULL as an array offset is deprecated in newer PHP versions.

Proposed resolution

Add condition isset( $element['format']['format']['#default_value']) on line 304

Issue fork webform-3619716

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3619716-using-null-as changes, plain diff MR !934
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Comments

Comment #1

28 August 2026 at 14:28

yaqbick created an issue. See original summary.

Comment #2

yaqbick commented 28 August 2026 at 14:28

Issue summary:

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Comment #3

28 August 2026 at 14:58

yaqbick opened merge request !934

Comment #4

alorenc

Wolsztyn, 🇵🇱

commented 31 August 2026 at 12:56

In my case, the field's stored filter format wasn't included in its #allowed_formats list, so TextFormat::processFormat() in core deliberately sets #default_value to NULL to force an admin to select a valid format.

The patch adds an isset($element['format']['format']['#default_value']) guard.