Error message

Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in Drupal\Core\Entity\Sql\SqlContentEntityStorage->mapFromStorageRecords() (line 474 of core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php).

Drupal\Core\Entity\Sql\SqlContentEntityStorage->mapFromStorageRecords() (Line: 428)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->getFromStorage() (Line: 394)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->doLoadMultiple() (Line: 312)
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 513)
Drupal\Core\Entity\EntityBase::loadMultiple() (Line: 2531)
Drupal\api\Formatter::otherProjectsLink() (Line: 4222)
Drupal\api\Formatter::searchLinks() (Line: 338)
Drupal\api\Controller\SearchController->searchListingPage()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)

Drupal\Core\Entity\Sql\SqlContentEntityStorage->mapFromStorageRecords() (Line: 428)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->getFromStorage() (Line: 394)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->doLoadMultiple() (Line: 312)
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 513)
Drupal\Core\Entity\EntityBase::loadMultiple() (Line: 2531)
Drupal\api\Formatter::otherProjectsLink() (Line: 4222)
Drupal\api\Formatter::searchLinks() (Line: 338)
Drupal\api\Controller\SearchController->searchListingPage()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)

Drupal\Core\Entity\Sql\SqlContentEntityStorage->mapFromStorageRecords() (Line: 428)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->getFromStorage() (Line: 394)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->doLoadMultiple() (Line: 312)
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 513)
Drupal\Core\Entity\EntityBase::loadMultiple() (Line: 2531)
Drupal\api\Formatter::otherProjectsLink() (Line: 4222)
Drupal\api\Formatter::searchLinks() (Line: 338)
Drupal\api\Controller\SearchController->searchListingPage()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)

Drupal\Core\Entity\Sql\SqlContentEntityStorage->mapFromStorageRecords() (Line: 428)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->getFromStorage() (Line: 394)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->doLoadMultiple() (Line: 312)
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 513)
Drupal\Core\Entity\EntityBase::loadMultiple() (Line: 2531)
Drupal\api\Formatter::otherProjectsLink() (Line: 4222)
Drupal\api\Formatter::searchLinks() (Line: 338)
Drupal\api\Controller\SearchController->searchListingPage()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)

Drupal\Core\Entity\Sql\SqlContentEntityStorage->mapFromStorageRecords() (Line: 428)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->getFromStorage() (Line: 394)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->doLoadMultiple() (Line: 312)
Drupal\Core\Entity\EntityStorageBase->loadMultiple() (Line: 513)
Drupal\Core\Entity\EntityBase::loadMultiple() (Line: 2531)
Drupal\api\Formatter::otherProjectsLink() (Line: 4222)
Drupal\api\Formatter::searchLinks() (Line: 338)
Drupal\api\Controller\SearchController->searchListingPage()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)

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Title	Object type	File name	Summary
ContextualUnitTest::testContextualIdToLinks	function	core/modules/contextual/tests/src/Kernel/ContextualUnitTest.php	Tests the conversion from contextual ID to links.
EntityBase::toLink	function	core/lib/Drupal/Core/Entity/EntityBase.php	Generates the HTML for a link to this entity.
EntityInterface::toLink	function	core/lib/Drupal/Core/Entity/EntityInterface.php	Generates the HTML for a link to this entity.
EntityLinkTest::testToLink	function	core/tests/Drupal/Tests/Core/Entity/EntityLinkTest.php	Tests for the Entity::toLink() method.
HelpTopicPluginBase::toLink	function	core/modules/help/src/HelpTopicPluginBase.php	Returns a link for viewing the help topic.
HelpTopicPluginInterface::toLink	function	core/modules/help/src/HelpTopicPluginInterface.php	Returns a link for viewing the help topic.
LinksetController::toLinkTargetObjects	function	core/modules/system/src/Controller/LinksetController.php	Encode a menu tree as link items and capture any cacheability metadata.
ViewUI::toLink	function	core/modules/views_ui/src/ViewUI.php	Generates the HTML for a link to this entity.

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