core/modules/rest/src/Routing/ResourceRoutes.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/core/modules/rest/src/Routing/ResourceRoutes.php b/core/modules/rest/src/Routing/ResourceRoutes.php
index 84e0797..1589bf4 100644
--- a/core/modules/rest/src/Routing/ResourceRoutes.php
+++ b/core/modules/rest/src/Routing/ResourceRoutes.php
@@ -64,8 +64,15 @@ public function __construct(ResourcePluginManager $manager, ConfigFactoryInterfa
    */
   protected function alterRoutes(RouteCollection $collection) {
     $routes = array();
+
+    // Silently ignore resources that are in the settings but are not defined on
+    // the plugin manager currently. That avoids exceptions when REST module is
+    // enabled before another module that provides the resource plugin specified
+    // in the settings.
+    // @todo Remove in https://www.drupal.org/node/2308745
     $resources = $this->config->get('rest.settings')->get('resources') ?: array();
     $enabled_resources = array_intersect_key($resources, $this->manager->getDefinitions());
+
     // Iterate over all enabled resource plugins.
     foreach ($enabled_resources as $id => $enabled_methods) {
       $plugin = $this->manager->getInstance(array('id' => $id));