diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
index 76faa0107e374..36b05857546de 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
@@ -147,7 +147,7 @@ private function addTwigOptions(ArrayNodeDefinition $rootNode)
->normalizeKeys(false)
->useAttributeAsKey('paths')
->beforeNormalization()
- ->always()
+ ->ifArray()
->then(function ($paths) {
$normalized = [];
foreach ($paths as $path => $namespace) {
diff --git a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/ConfigurationTest.php b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/ConfigurationTest.php
index 41627c48041e3..6ed43087579ce 100644
--- a/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/ConfigurationTest.php
+++ b/src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/ConfigurationTest.php
@@ -52,4 +52,16 @@ public function testArrayKeysInGlobalsAreNotNormalized()
$this->assertSame(['global' => ['value' => ['some-key' => 'some-value']]], $config['globals']);
}
+
+ public function testNullPathsAreConvertedToIterable()
+ {
+ $input = [
+ 'paths' => null,
+ ];
+
+ $processor = new Processor();
+ $config = $processor->processConfiguration(new Configuration(), [$input]);
+
+ $this->assertSame([], $config['paths']);
+ }
}
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