fixed an undefined var
diff --git a/system/libraries/Loader.php b/system/libraries/Loader.php
index aede38d..e634c38 100644
--- a/system/libraries/Loader.php
+++ b/system/libraries/Loader.php
@@ -697,6 +697,7 @@
 			}

 		

 			// Lets search for the requested library file and load it.

+			$is_duplicate = FALSE;		

 			for ($i = 1; $i < 3; $i++)

 			{

 				$path = ($i % 2) ? APPPATH : BASEPATH;	

@@ -711,6 +712,7 @@
 				// Safety:  Was the class already loaded by a previous call?

 				if (in_array($fp, $this->_ci_classes))

 				{

+					$is_duplicate = TRUE;

 					log_message('debug', $class." class already loaded. Second attempt ignored.");

 					return;

 				}