diff --git a/composer.json b/composer.json
index 5aad66c..dcb21da 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "oneflow/php-sdk",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "PHP SDK for OneFlow",
   "minimum-stability": "stable",
   "license": "OneFlow Master",
diff --git a/src/ProductionSDK.php b/src/ProductionSDK.php
index 9823816..9af85b8 100644
--- a/src/ProductionSDK.php
+++ b/src/ProductionSDK.php
@@ -1,5 +1,8 @@
 <?php
-require_once 'OneFlowSDK.php';
+
+if (!class_exists('OneflowSDK')) {
+	require_once 'OneFlowSDK.php';
+}
 
 class ProductionSDK extends OneflowSDK	{