diff --git a/main/inc/lib/course.lib.php b/main/inc/lib/course.lib.php
index 0333c43e79..278486fd89 100644
--- a/main/inc/lib/course.lib.php
+++ b/main/inc/lib/course.lib.php
@@ -122,7 +122,7 @@ class CourseManager {
         if (api_get_multiple_access_url()) {		
             $access_url_id = api_get_current_access_url_id();
         }
-        if ($_configuration[$access_url_id]['hosting_limit_courses'] > 0) {
+        if (is_array($_configuration[$access_url_id]) && isset($_configuration[$access_url_id]['hosting_limit_courses']) && $_configuration[$access_url_id]['hosting_limit_courses'] > 0) {
             $num = self::count_courses();
             if ($num >= $_configuration[$access_url_id]['hosting_limit_courses']) {
                 return api_set_failure('PortalCoursesLimitReached');
diff --git a/main/inc/lib/sessionmanager.lib.php b/main/inc/lib/sessionmanager.lib.php
index 3afecb1092..89c51e5c80 100644
--- a/main/inc/lib/sessionmanager.lib.php
+++ b/main/inc/lib/sessionmanager.lib.php
@@ -62,7 +62,7 @@ class SessionManager {
         	if (api_get_multiple_access_url()) {
 	            $access_url_id = api_get_current_access_url_id();
         	}
-	        if ($_configuration[$access_url_id]['hosting_limit_sessions'] > 0) {
+	        if (is_array($_configuration[$access_url_id]) && isset($_configuration[$access_url_id]['hosting_limit_sessions']) && $_configuration[$access_url_id]['hosting_limit_sessions'] > 0) {
         	    $num = self::count_sessions();
 	            if ($num >= $_configuration[$access_url_id]['hosting_limit_sessions']) {
         	        return get_lang('PortalSessionsLimitReached');
diff --git a/main/inc/lib/usermanager.lib.php b/main/inc/lib/usermanager.lib.php
index 48820133e1..fad1ee88ff 100644
--- a/main/inc/lib/usermanager.lib.php
+++ b/main/inc/lib/usermanager.lib.php
@@ -77,30 +77,30 @@ class UserManager {
 	public static function create_user($firstName, $lastName, $status, $email, $loginName, $password, $official_code = '', $language = '', $phone = '', $picture_uri = '', $auth_source = PLATFORM_AUTH_SOURCE, $expiration_date = '0000-00-00 00:00:00', $active = 1, $hr_dept_id = 0, $extra = null, $encrypt_method = '') {
 		global $_user, $_configuration;
 
-		$firstName 	= Security::remove_XSS($firstName);
-		$lastName	= Security::remove_XSS($lastName);
-		$loginName 	= Security::remove_XSS($loginName);
-		$phone 		= Security::remove_XSS($phone);
-		
-		// database table definition
-		$table_user = Database::get_main_table(TABLE_MAIN_USER);
                 $access_url_id = 1;
 		if (api_get_multiple_access_url()) {		
                   $access_url_id = api_get_current_access_url_id();
                 }
-		if ($_configuration[$access_url_id]['hosting_limit_users'] > 0) {
+		if (is_array($_configuration[$access_url_id]) && isset($_configuration[$access_url_id]['hosting_limit_users']) && $_configuration[$access_url_id]['hosting_limit_users'] > 0) {
                   $num = self::get_number_of_users();
                   if ($num >= $_configuration[$access_url_id]['hosting_limit_users']) {
                     return api_set_failure('portal users limit reached');
                   }
                 }
-		if ($status === 1 && $_configuration[$access_url_id]['hosting_limit_teachers'] > 0) {
+		if ($status === 1 && is_array($_configuration[$access_url_id]) && isset($_configuration[$access_url_id]['hosting_limit_teachers']) && $_configuration[$access_url_id]['hosting_limit_teachers'] > 0) {
                   $num = self::get_number_of_users(1);
                   if ($num >= $_configuration[$access_url_id]['hosting_limit_teachers']) {
                     return api_set_failure('portal teachers limit reached');
                   }
                 }
 		
+		$firstName 	= Security::remove_XSS($firstName);
+		$lastName	= Security::remove_XSS($lastName);
+		$loginName 	= Security::remove_XSS($loginName);
+		$phone 		= Security::remove_XSS($phone);
+		
+		// database table definition
+		$table_user = Database::get_main_table(TABLE_MAIN_USER);
 
     	//Checking the user language
         $languages = api_get_languages();