diff --git a/core/lib/Drupal/Core/Access/CustomAccessCheck.php b/core/lib/Drupal/Core/Access/CustomAccessCheck.php
index e7a3b08..3893cb0 100644
--- a/core/lib/Drupal/Core/Access/CustomAccessCheck.php
+++ b/core/lib/Drupal/Core/Access/CustomAccessCheck.php
@@ -61,7 +61,12 @@ 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) {
+      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);