diff --git a/core/config.class.inc.php b/core/config.class.inc.php
index bdefc6940..aa85e2edb 100644
--- a/core/config.class.inc.php
+++ b/core/config.class.inc.php
@@ -409,7 +409,7 @@ class Config
 		}
 		$this->m_aAppModules = $MyModules['application'];
 		$this->m_aDataModels = $MyModules['business'];
-		$this->m_aWebServiceCategories = $MyModules['webservices'];
+		$this->m_aWebServiceCategories = isset($MyModules['webservices']) ? $MyModules['webservices'] : array();
 		$this->m_aAddons = $MyModules['addons'];
 		$this->m_aDictionaries = $MyModules['dictionaries'];