TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in ModuleRequiredByThemesUninstallValidator.php on line 99

Thanks for reporting a core bug.

We have seen a lot of bug reports like this suggesting defensive coding solutions, but in many cases the real problem is wrong API implementations by contributed or custom code.

Can you please get a stack trace and determine the project that is passing the bad value?

Thank you!

I am postponing pending steps to reproduce. Viewing the Uninstall UI is a common activity that has test coverage so I don't think this bug is experienced widely.

Hard to reproduce this error, any idea?

Below is the complete error log when I visit Module-Uninstall:

[26-Mar-2023 19:32:41 Asia/Jakarta] TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /home/dempodru0835/public_html/core/lib/Drupal/Core/Extension/ModuleRequiredByThemesUninstallValidator.php on line 99 #0 /home/dempodru0835/public_html/core/lib/Drupal/Core/Extension/ModuleRequiredByThemesUninstallValidator.php(99): in_array()
#1 [internal function]: Drupal\Core\Extension\ModuleRequiredByThemesUninstallValidator->Drupal\Core\Extension\{closure}()
#2 /home/dempodru0835/public_html/core/lib/Drupal/Core/Extension/ModuleRequiredByThemesUninstallValidator.php(98): array_map()
#3 /home/dempodru0835/public_html/core/lib/Drupal/Core/Extension/ModuleRequiredByThemesUninstallValidator.php(52): Drupal\Core\Extension\ModuleRequiredByThemesUninstallValidator->getThemesDependingOnModule()
#4 /home/dempodru0835/public_html/core/lib/Drupal/Core/Extension/ModuleInstaller.php(624): Drupal\Core\Extension\ModuleRequiredByThemesUninstallValidator->validate()
#5 /home/dempodru0835/public_html/core/lib/Drupal/Core/ProxyClass/Extension/ModuleInstaller.php(99): Drupal\Core\Extension\ModuleInstaller->validateUninstall()
#6 /home/dempodru0835/public_html/core/modules/system/src/Form/ModulesUninstallForm.php(165): Drupal\Core\ProxyClass\Extension\ModuleInstaller->validateUninstall()
#7 [internal function]: Drupal\system\Form\ModulesUninstallForm->buildForm()
#8 /home/dempodru0835/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(534): call_user_func_array()
#9 /home/dempodru0835/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(281): Drupal\Core\Form\FormBuilder->retrieveForm()
#10 /home/dempodru0835/public_html/core/lib/Drupal/Core/Controller/FormController.php(73): Drupal\Core\Form\FormBuilder->buildForm()
#11 [internal function]: Drupal\Core\Controller\FormController->getContentResult()
#12 /home/dempodru0835/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
#13 /home/dempodru0835/public_html/core/lib/Drupal/Core/Render/Renderer.php(580): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#14 /home/dempodru0835/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext()
#15 /home/dempodru0835/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
#16 /home/dempodru0835/public_html/vendor/symfony/http-kernel/HttpKernel.php(169): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#17 /home/dempodru0835/public_html/vendor/symfony/http-kernel/HttpKernel.php(81): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#18 /home/dempodru0835/public_html/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle()
#19 /home/dempodru0835/public_html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
#20 /home/dempodru0835/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#21 /home/dempodru0835/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass()
#22 /home/dempodru0835/public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle()
#23 /home/dempodru0835/public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#24 /home/dempodru0835/public_html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#25 /home/dempodru0835/public_html/core/lib/Drupal/Core/DrupalKernel.php(718): Stack\StackedHttpKernel->handle()
#26 /home/dempodru0835/public_html/index.php(19): Drupal\Core\DrupalKernel->handle()
#27 {main}

Fixed.

I found my .info.yml file contains "dependencies" but the folder deleted.
Just upload the dependency manually then works fine!

Takes hours .. because Drupal does not report the module name. I suggest Drupal stop the process after ONE error occured, maybe a variable in settings.php for debugging.

In my case what solved it was that my custom theme's info.yml contained a core/once dependency, while my themes's libraries.yml already contained that dependency. I removed the dependencies code block from my info.yml and that fixed it.