The "" entity type does not exist error on access-info-by-url

Problem/Motivation

I'm not sure if this is a bug or a support request so I will file it as the latter for now.

I'm seeing PHP errors like the one below in watchdog when opening a PbT-enabled node for editing.

I can stop the errors by editing the getFormInfoByUrl function in /src/Controller/NodeEntityBundleController.php as follows:

-    $contentType = $this->getContentType($this->requestStack->getCurrentRequest()->query->get('url'));
+    if (null!==($this->requestStack->getCurrentRequest()->query->get('url'))) {
+      $contentType = $this->getContentType($this->requestStack->getCurrentRequest()->query->get('url'));
+    } 
+    else {
+      $contentType = NULL;
+    }

But I'd like to understand why

$contentType = $this->getContentType($this->requestStack->getCurrentRequest()->query->get('url')) 

would be null in the first place. I hope someone smarter than me can decipher the stack trace.

Type 	php
Date 	xxxxxx
User 	xxxxxx
Location 	https://xxxxxx/admin/permissions-by-term/access-info-by-url
Referrer 	https://xxxxxx/node/271933/edit
Message 	Drupal\Component\Plugin\Exception\PluginNotFoundException: The "" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (line 142 of /path/to/web/core/lib/Drupal/Core/Entity/EntityTypeManager.php).
Severity 	Error
Hostname 	x.x.x.xxx

#0 /path/to/web/core/lib/Drupal/Core/Entity/EntityTypeManager.php(260): Drupal\Core\Entity\EntityTypeManager->getDefinition(NULL)
#1 /path/to/web/core/lib/Drupal/Core/Entity/EntityTypeManager.php(195): Drupal\Core\Entity\EntityTypeManager->getHandler(NULL, 'storage')
#2 /path/to/web/modules/contrib/permissions_by_term/src/Controller/NodeEntityBundleController.php(151): Drupal\Core\Entity\EntityTypeManager->getStorage(NULL)
#3 /path/to/web/modules/contrib/permissions_by_term/src/Controller/NodeEntityBundleController.php(111): Drupal\permissions_by_term\Controller\NodeEntityBundleController->getContentType(NULL)
#4 [internal function]: Drupal\permissions_by_term\Controller\NodeEntityBundleController->getFormInfoByUrl()
#5 /path/to/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)
#6 /path/to/web/core/lib/Drupal/Core/Render/Renderer.php(638): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#7 /path/to/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#8 /path/to/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)
#9 /path/to/vendor/symfony/http-kernel/HttpKernel.php(181): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#10 /path/to/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#11 /path/to/web/core/lib/Drupal/Core/StackMiddleware/Session.php(53): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#12 /path/to/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#13 /path/to/web/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#14 /path/to/web/core/modules/big_pipe/src/StackMiddleware/ContentLength.php(32): Drupal\Core\StackMiddleware\ContentLength->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#15 /path/to/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(116): Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#16 /path/to/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(90): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#17 /path/to/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#18 /path/to/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#19 /path/to/web/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(36): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 /path/to/web/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(51): Drupal\Core\StackMiddleware\AjaxPageState->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 /path/to/web/core/lib/Drupal/Core/DrupalKernel.php(741): Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 /path/to/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#23 {main}