diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index ceeea9245f..7b659d1671 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -807,7 +807,7 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
             $fs->dumpFile($dir.$file, $code);
             @chmod($dir.$file, 0666 & ~umask());
         }
-        $legacyFile = \dirname($dir.$file).'.legacy';
+        $legacyFile = \dirname($dir.key($content)).'.legacy';
         if (file_exists($legacyFile)) {
             @unlink($legacyFile);
         }
diff --git a/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php b/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
index ef53d44204..33b6060abf 100644
--- a/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
+++ b/src/Symfony/Component/Routing/Loader/Configurator/RoutingConfigurator.php
@@ -36,7 +36,8 @@ class RoutingConfigurator
     final public function import($resource, string $type = null, bool $ignoreErrors = false): ImportConfigurator
     {
         $this->loader->setCurrentDir(\dirname($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 c371f74a80..b7e7aeb410 100644
--- a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
@@ -166,7 +166,7 @@ class XmlFileLoader extends FileLoader
         $this->setCurrentDir(\dirname($path));
 
         /** @var RouteCollection[] $imported */
-        $imported = $this->import($resource, ('' !== $type ? $type : null), false, $file);
+        $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 2dba247273..d9593fb3fd 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -185,7 +185,7 @@ 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];
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/controller/empty_wildcard/.gitignore b/src/Symfony/Component/Routing/Tests/Fixtures/controller/empty_wildcard/.gitignore
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/import_with_name_prefix/routing.yml b/src/Symfony/Component/Routing/Tests/Fixtures/import_with_name_prefix/routing.yml
index 90dce0ea1b..057b7b2d6b 100644
--- a/src/Symfony/Component/Routing/Tests/Fixtures/import_with_name_prefix/routing.yml
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/import_with_name_prefix/routing.yml
@@ -5,3 +5,7 @@ api:
     resource: ../controller/routing.yml
     name_prefix: api_
     prefix: /api
+
+empty_wildcard:
+    resource: ../controller/empty_wildcard/*
+    prefix: /empty_wildcard