diff --git a/libraries/joomla/session/handler/joomla.php b/libraries/joomla/session/handler/joomla.php
index d5486e63b2906..f1e6434e821d0 100644
--- a/libraries/joomla/session/handler/joomla.php
+++ b/libraries/joomla/session/handler/joomla.php
@@ -42,13 +42,6 @@ class JSessionHandlerJoomla extends JSessionHandlerNative
 	 */
 	public function __construct($options = array())
 	{
-		// Disable transparent sid support
-		ini_set('session.use_trans_sid', '0');
-
-		// Only allow the session ID to come from cookies and nothing else.
-		ini_set('session.use_only_cookies', '1');
-
-		// Set options
 		$this->setOptions($options);
 		$this->setCookieParams();
 	}
@@ -79,6 +72,16 @@ public function start()
 			}
 		}
 
+		// Only allow session config to be changed if no session yet started to avoid warnings
+		if ($this->getId() === "")
+		{
+			// Disable transparent sid support
+			ini_set('session.use_trans_sid', '0');
+
+			// Only allow the session ID to come from cookies and nothing else.
+			ini_set('session.use_only_cookies', '1');
+		}
+
 		return parent::start();
 	}