diff --git a/disqusapi/disqusapi.php b/disqusapi/disqusapi.php
index 00ff7eb..97d5dce 100644
--- a/disqusapi/disqusapi.php
+++ b/disqusapi/disqusapi.php
@@ -75,7 +75,7 @@ public function __call($name, $args) {
         if (!$resource) {
             throw new DisqusInterfaceNotDefined();
         }
-        $kwargs = (array)$args[0];
+        $kwargs = isset($args[0]) ? (array)$args[0] : array();
 
         foreach ((array)$resource->required as $k) {
             if (empty($kwargs[$k])) {
@@ -147,4 +147,4 @@ public function setFormat($format) {
     public function setVersion($version) {
         $this->version = $version;
     }
-}
\ No newline at end of file
+}