diff --git a/build/lightdb/core/lightdb.php b/build/lightdb/core/lightdb.php
index 7910be1..7aaf32e 100644
--- a/build/lightdb/core/lightdb.php
+++ b/build/lightdb/core/lightdb.php
@@ -114,9 +114,11 @@
 		*
 		*/
 		public function insert($key, $data){
+			$already_line = $this->line;
+
 			/* (1) On vérifie que la clé est unique */
-			// if( array_key_exists($key, $this->index) )
-			// 	return true;
+			if( !array_key_exists($key, $this->index) ){
+				$already_line = $this->index[$key]['line'];
 
 			$key = (string) $key;