this did't work

ag/include/arena.inc.php

@@ -57,12 +57,12 @@ function calculateRenovierungsKosten($arena){
 }
 
 function getArena($user_id) {
-	$sql = 'SELECT * FROM arena where besitzer = \''.$user_id.'\'';
+	$sql_select = 'SELECT * FROM arena where besitzer = \''.$user_id.'\'';
-	$qry = mysql_query($sql);
+	$qry = mysql_query($sql_select);
 	if(mysql_num_rows($qry) == 0) {
 			$sql = 'INSERT arena(besitzer, exp) values (\''.$user_id.'\', \'0,'.calculateRequiredExpArena(1).'\')';
 			mysql_query($sql);
-			$qry = mysql_query($sql);
+			$qry = mysql_query($sql_select);
 	}
 	$arena = mysql_fetch_assoc($qry);
 	return $arena;