Deprecated error with PHP 8.5 on entity forms without pathauto patterns. [#3579655]

Problem/Motivation

A deprecated warning is triggered when adding a content item with URL-Alias in the form. If there is no URL-Pattern for this content type you get a deprecated warning. ONLY ON PHP 8.5!

Steps to reproduce

Fresh DDEV setup
PHP Version 8.5
Drupal Version ~11.3.0
Edit a content type with URL-Alias in the form BUT without a pattern.

Proposed resolution

Investigate and fix the deprecated warning caused by using a null value as an array offset in `PathautoGenerator`. Ensure that all array keys used for cached pattern lookups are normalized before access.

Remaining tasks

User interface changes

API changes

Data model changes

Comment	File	Size	Author
#14	pathauto-3579655-14.patch	1.55 KB	pasan.gamage
#11	pathauto-3579655-11-fix-deprecation-errors-on-8-1-14.patch	1.81 KB	ewout goosmann

Issue fork pathauto-3579655

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3579655-depricated-error-when changes, plain diff MR !169
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Comments

Comment #1

17 March 2026 at 09:52

gashunk created an issue. See original summary.

Comment #2

17 March 2026 at 09:59

gashunk opened merge request !169

Comment #3

gashunk commented 17 March 2026 at 10:00

Status:

Needs work

» Needs review

Comment #4

gashunk commented 17 March 2026 at 11:05

Title:

Depricated error when adding media item.

» Deprecated error when adding media item.

Comment #5

mably commented 17 March 2026 at 12:46

Status:	Needs review	» Postponed (maintainer needs more info)
Issue tags:		+Needs steps to reproduce, +Needs tests

Can you give us a full reproducible scenario on a fresh Drupal instance please (Drupal version, PHP version, etc.)?

I haven't been able to reproduce the problem locally.

Could you eventually share the full stack trace of the warning you get?

Comment #6

gashunk commented 18 March 2026 at 10:41

Status:

Postponed (maintainer needs more info)

» Needs review

Hey I can reproduce this using:
Fresh DDEV setup
PHP Version 8.5
Drupal Version ~11.3.0
Only installed Pathauto module

Edit a content type with URL-Alias in the form BUT without a pattern.

Full stack trace:

Deprecated function: Using null as an array offset is deprecated, use an empty string instead in Drupal\pathauto\PathautoGenerator->getPatternByEntity() (line 351 of /var/www/html/web/modules/contrib/pathauto/src/PathautoGenerator.php)

#0 /var/www/html/web/core/includes/bootstrap.inc(104): _drupal_error_handler_real()
#1 /var/www/html/web/modules/contrib/pathauto/src/PathautoGenerator.php(351): _drupal_error_handler()
#2 /var/www/html/web/modules/contrib/pathauto/src/PathautoWidget.php(80): Drupal\pathauto\PathautoGenerator->getPatternByEntity()
#3 /var/www/html/web/core/lib/Drupal/Core/Field/WidgetBase.php(464): Drupal\pathauto\PathautoWidget->formElement()
#4 /var/www/html/web/core/lib/Drupal/Core/Field/WidgetBase.php(222): Drupal\Core\Field\WidgetBase->formSingleElement()
#5 /var/www/html/web/core/lib/Drupal/Core/Field/WidgetBase.php(120): Drupal\Core\Field\WidgetBase->formMultipleElements()
#6 /var/www/html/web/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php(197): Drupal\Core\Field\WidgetBase->form()
#7 /var/www/html/web/core/lib/Drupal/Core/Entity/ContentEntityForm.php(121): Drupal\Core\Entity\Entity\EntityFormDisplay->buildForm()
#8 /var/www/html/web/core/modules/node/src/Form/NodeForm.php(140): Drupal\Core\Entity\ContentEntityForm->form()
#9 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityForm.php(108): Drupal\node\Form\NodeForm->form()
#10 [internal function]: Drupal\Core\Entity\EntityForm->buildForm()
#11 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(554): call_user_func_array()
#12 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(303): Drupal\Core\Form\FormBuilder->retrieveForm()
#13 /var/www/html/web/core/lib/Drupal/Core/Controller/FormController.php(73): Drupal\Core\Form\FormBuilder->buildForm()
#14 [internal function]: Drupal\Core\Controller\FormController->getContentResult()
#15 /var/www/html/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
#16 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(634): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::wrapControllerExecutionInRenderContext():121}()
#17 [internal function]: Drupal\Core\Render\Renderer::{closure:Drupal\Core\Render\Renderer::executeInRenderContext():634}()
#18 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(635): Fiber->start()
#19 /var/www/html/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(121): Drupal\Core\Render\Renderer->executeInRenderContext()
#20 /var/www/html/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
#21 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(183): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::onController():96}()
#22 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#23 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/Session.php(53): Symfony\Component\HttpKernel\HttpKernel->handle()
#24 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
#25 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#26 /var/www/html/web/core/modules/big_pipe/src/StackMiddleware/ContentLength.php(32): Drupal\Core\StackMiddleware\ContentLength->handle()
#27 /var/www/html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(118): Drupal\big_pipe\StackMiddleware\ContentLength->handle()
#28 /var/www/html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(92): Drupal\page_cache\StackMiddleware\PageCache->pass()
#29 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle()
#30 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#31 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(53): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#32 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(54): Drupal\Core\StackMiddleware\AjaxPageState->handle()
#33 /var/www/html/web/core/lib/Drupal/Core/DrupalKernel.php(745): Drupal\Core\StackMiddleware\StackedHttpKernel->handle()
#34 /var/www/html/web/index.php(19): Drupal\Core\DrupalKernel->handle()
#35 {main}

Hopes that helps!