diff --git a/core/lib/Drupal/Core/Access/CustomAccessCheck.php b/core/lib/Drupal/Core/Access/CustomAccessCheck.php
index e7a3b08..353d09c 100644
--- a/core/lib/Drupal/Core/Access/CustomAccessCheck.php
+++ b/core/lib/Drupal/Core/Access/CustomAccessCheck.php
@@ -61,7 +61,14 @@ public function __construct(ControllerResolverInterface $controller_resolver, Ac
    *   The access result.
    */
   public function access(Route $route, RouteMatchInterface $route_match, AccountInterface $account) {
-    $callable = $this->controllerResolver->getControllerFromDefinition($route->getRequirement('_custom_access'));
+    try {
+      $callable = $this->controllerResolver->getControllerFromDefinition($route->getRequirement('_custom_access'));
+    }
+    catch (\InvalidArgumentException $e) {
+      // The custom access controller method was not found.
+      throw new \BadMethodCallException(sprintf('The "%s" method is not callable as a _custom_access callback in route "%s"', $route->getRequirement('_custom_access'), $route->getPath()));
+    }
+
     $arguments_resolver = $this->argumentsResolverFactory->getArgumentsResolver($route_match, $account);
     $arguments = $arguments_resolver->getArguments($callable);
 
diff --git a/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php
index 36d330d..b1e7629 100644
--- a/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/CustomAccessCheckTest.php
@@ -7,9 +7,16 @@
 
 namespace Drupal\Tests\Core\Access;
 
+use Drupal\Core\Access\AccessArgumentsResolverFactoryInterface;
 use Drupal\Core\Access\AccessResult;
 use Drupal\Core\Access\CustomAccessCheck;
+use Drupal\Core\Controller\ControllerResolver;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\DependencyInjection\ClassResolver;
 use Drupal\Tests\UnitTestCase;
+use Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\Routing\Route;
 
 /**
@@ -106,6 +113,28 @@ public function testAccess() {
     $this->assertEquals(AccessResult::allowed(), $this->accessChecker->access($route, $route_match, $account));
   }
 
+  /*
+   * Test the access method exception for invalid access callbacks.
+   */
+  public function testAccessException() {
+
+    $container = new ContainerBuilder();
+    $class_resolver = new ClassResolver();
+    $class_resolver->setContainer($container);
+    $httpMessageFactory = new DiactorosFactory();
+    $controllerResolver = new ControllerResolver($httpMessageFactory, $class_resolver);
+
+    $this->argumentsResolverFactory = $this->getMock(AccessArgumentsResolverFactoryInterface::class);
+    $this->accessChecker = new CustomAccessCheck($controllerResolver, $this->argumentsResolverFactory);
+
+    $route = new Route('/test-route', array(), array('_custom_access' => '\Drupal\Tests\Core\Access\NonExistantController::nonexistantmethod'));
+    $route_match = $this->getMock(RouteMatchInterface::class);
+    $account = $this->getMock(AccountInterface::class);
+
+    $this->setExpectedException(\BadMethodCallException::class);
+
+    $this->accessChecker->access($route, $route_match, $account);
+  }
 }
 
 class TestController {