diff --git a/core/modules/views/src/Plugin/views/display/PathPluginBase.php b/core/modules/views/src/Plugin/views/display/PathPluginBase.php
index 175c41b..0fe53ad 100644
--- a/core/modules/views/src/Plugin/views/display/PathPluginBase.php
+++ b/core/modules/views/src/Plugin/views/display/PathPluginBase.php
@@ -245,6 +245,10 @@ public function alterRoutes(RouteCollection $collection) {
       // Ensure that we don't override a route which is already controlled by
       // views.
       if (!$route->hasDefault('view_id') && ('/' . $view_path == $route_path)) {
+        // The path variables array may have arbitrary keys, so take just the
+        // values to ensure we have a simple numeric array starting from 0.
+        $parameters = array_values($route->compile()->getPathVariables());
+
         // @todo Figure out whether we need to merge some settings (like
         // requirements).
 
@@ -259,9 +263,6 @@ public function alterRoutes(RouteCollection $collection) {
         $path = $route->getPath();
         // Replace the path with the original parameter names and add a mapping.
         $argument_map = array();
-        // The path variables array may have arbitrary keys, so take just the
-        // values to ensure we have a simple numeric array starting from 0.
-        $parameters = array_values($route->compile()->getPathVariables());
         // We assume that the numeric ids of the parameters match the one from
         // the view argument handlers.
         foreach ($parameters as $position => $parameter_name) {