diff --git a/composer.json b/composer.json
index eaa8e87b..80c4caef 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "leafo/scssphp",
+    "name": "cristicsk/scssphp",
     "type": "library",
     "description": "scssphp is a compiler for SCSS written in PHP.",
     "keywords": ["css", "stylesheet", "scss", "sass", "less"],
diff --git a/src/Compiler.php b/src/Compiler.php
index d22d0a35..8ced4087 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -4373,7 +4373,7 @@ protected function sortArgs($prototype, $args)
         foreach ($args as $arg) {
             list($key, $value) = $arg;
 
-            $key = $key[1];
+            $key = $key[1] ?? null;
 
             if (empty($key)) {
                 $posArgs[] = empty($arg[2]) ? $value : $arg;