Empty Watchdog text causing error 500 with WSOD

Problem/Motivation

When saving entities with logging enabled, we are seeing a WSOD.

Steps to reproduce

I'm still working through all of the details, but it seems that saving any node or media entity with logging enabled triggers a fatal error.

The website encountered an unexpected error. Please try again later.

Drupal\Core\Entity\EntityStorageException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'message' cannot be null: INSERT INTO "watchdog" ("uid", "type", "message", "variables", "severity", "link", "location", "referer", "hostname", "timestamp") VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array ( [:db_insert_placeholder_0] => 1 [:db_insert_placeholder_1] => elogger [:db_insert_placeholder_2] => [:db_insert_placeholder_3] => a:0:{} [:db_insert_placeholder_4] => 5 [:db_insert_placeholder_5] => [:db_insert_placeholder_6] => https://www.psh-content-staging-hpdlooi-6wpxgm77wdu6y.us-3.platformsh.site/node/1371/edit?destination=%2Fadmin%2Fcontent [:db_insert_placeholder_7] => https://www.psh-content-staging-hpdlooi-6wpxgm77wdu6y.us-3.platformsh.site/node/1371/edit?destination=/admin/content [:db_insert_placeholder_8] => 98.214.67.55 [:db_insert_placeholder_9] => 1647983736 ) in Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (line 811 of core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php).
Drupal\Core\Database\StatementWrapper->execute(Array, Array) (Line: 937)
Drupal\Core\Database\Connection->query('INSERT INTO {watchdog} ("uid", "type", "message", "variables", "severity", "link", "location", "referer", "hostname", "timestamp") VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9)', Array, Array) (Line: 32)
Drupal\Core\Database\Driver\mysql\Insert->execute() (Line: 78)
Drupal\dblog\Logger\DbLog->log(5, NULL, Array) (Line: 103)
Drupal\dblog\Logger\DbLog->log(5, NULL, Array) (Line: 127)
Drupal\Core\Logger\LoggerChannel->log(5, NULL, Array) (Line: 108)
Drupal\elogger\Logger\EventLog->logEvent(Array) (Line: 565)
Drupal\elogger\Services\Elogger->logEvent('entity_update') (Line: 43)
_log_entity_event('entity_update', Object) (Line: 27)
elogger_entity_update(Object)
call_user_func_array('elogger_entity_update', Array) (Line: 403)
Drupal\Core\Extension\ModuleHandler->invokeAll('entity_update', Array) (Line: 251)
Drupal\Core\Entity\EntityStorageBase->invokeHook('update', Object) (Line: 897)
Drupal\Core\Entity\ContentEntityStorageBase->invokeHook('update', Object) (Line: 602)
Drupal\Core\Entity\EntityStorageBase->doPostSave(Object, 1) (Line: 782)
Drupal\Core\Entity\ContentEntityStorageBase->doPostSave(Object, 1) (Line: 527)
Drupal\Core\Entity\EntityStorageBase->save(Object) (Line: 802)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->save(Object) (Line: 339)
Drupal\Core\Entity\EntityBase->save() (Line: 746)
token_node_menu_link_submit('node', Object, Array, Object)
call_user_func_array('token_node_menu_link_submit', Array) (Line: 299)
Drupal\Core\Entity\EntityForm->buildEntity(Array, Object) (Line: 155)
Drupal\Core\Entity\ContentEntityForm->buildEntity(Array, Object) (Line: 278)
Drupal\Core\Entity\EntityForm->submitForm(Array, Object) (Line: 145)
Drupal\Core\Entity\ContentEntityForm->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 114)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 52)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 592)
Drupal\Core\Form\FormBuilder->processForm('node_page_edit_form', Array, Object) (Line: 320)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 564)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 158)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 80)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Proposed resolution

Ensure we aren't logging an empty string?

Remaining tasks

Fully understand the problem and implement a fix.

User interface changes

N/A

API changes

N/A

Data model changes

N/A