diff --git a/src/DependencyInjection/SymfonycastsSassExtension.php b/src/DependencyInjection/SymfonycastsSassExtension.php
index c07d9a4..fdadc0e 100644
--- a/src/DependencyInjection/SymfonycastsSassExtension.php
+++ b/src/DependencyInjection/SymfonycastsSassExtension.php
@@ -61,7 +61,7 @@ public function getConfigTreeBuilder(): TreeBuilder
                         ->end()
                     ->validate()
                         ->ifTrue(static function (array $paths): bool {
-                            if (1 === \count($paths)) {
+                            if (1 === \count($paths) || !\array_is_list($paths)) {
                                 return false;
                             }
 
diff --git a/tests/ConfigurationTest.php b/tests/ConfigurationTest.php
index f1b724e..0ca35fb 100644
--- a/tests/ConfigurationTest.php
+++ b/tests/ConfigurationTest.php
@@ -47,6 +47,18 @@ public function testMultipleSassRootPaths(): void
         ]);
     }
 
+    public function testMultipleSassRootPathsWithIdentifier(): void
+    {
+        $this->assertConfigurationIsValid([
+            'symfonycasts_sass' => [
+                'root_sass' => [
+                    'website' => '%kernel.project_dir%/assets/scss/app.scss',
+                    'admin' => '%kernel.project_dir%/assets/admin/scss/app.scss',
+                ],
+            ],
+        ]);
+    }
+
     public function testMultipleSassRootPathsWithSameFilename(): void
     {
         $this->assertConfigurationIsInvalid([