Issue #3046872 catch ResourceNotFoundException

Closes #3046872

src/Controller/FacetBlockAjaxController.php

@@ -14,6 +14,7 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\Routing\Exception\ResourceNotFoundException;
 use Symfony\Component\Routing\RouterInterface;
 
 /**
@@ -135,7 +136,13 @@ class FacetBlockAjaxController extends ControllerBase {
     $processed_request = Request::create($processed);
 
     $this->currentPath->setPath($processed_request->getPathInfo());
-    $request->attributes->add($this->router->matchRequest($new_request));
+    try {
+      $request->attributes->add($this->router->matchRequest($new_request));
+    }
+    catch (ResourceNotFoundException $exception) {
+      throw new NotFoundHttpException('No route found for new facets block ajax request.');
+    }
+
     $this->currentRouteMatch->resetRouteMatch();
     $request_stack->push($new_request);