diff --git a/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
index 7614caea3d..d0cc02d1c3 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
@@ -39,7 +39,8 @@ class RoutingConfigurator
     final public function import($resource, $type = null, $ignoreErrors = false)
     {
         $this->loader->setCurrentDir(\dirname($this->path));
-        $imported = $this->loader->import($resource, $type, $ignoreErrors, $this->file);
+        $imported = $this->loader->import($resource, $type, $ignoreErrors, $this->file) ?: [];
+
         if (!\is_array($imported)) {
             return new ImportConfigurator($this->collection, $imported);
         }
diff --git a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
index c114310fc3..29dfdb1665 100644
--- a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
@@ -146,7 +146,8 @@ class XmlFileLoader extends FileLoader
 
         $this->setCurrentDir(\dirname($path));
 
-        $imported = $this->import($resource, ('' !== $type ? $type : null), false, $file);
+        /** @var RouteCollection[] $imported */
+        $imported = $this->import($resource, ('' !== $type ? $type : null), false, $file) ?: [];
 
         if (!\is_array($imported)) {
             $imported = [$imported];
diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index bc21e9cb4d..568827695b 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -158,7 +158,7 @@ class YamlFileLoader extends FileLoader
 
         $this->setCurrentDir(\dirname($path));
 
-        $imported = $this->import($config['resource'], $type, false, $file);
+        $imported = $this->import($config['resource'], $type, false, $file) ?: [];
 
         if (!\is_array($imported)) {
             $imported = [$imported];