diff --git a/src/arenas/tron/act.php b/src/arenas/tron/act.php
index e825e0c..3a7e539 100644
--- a/src/arenas/tron/act.php
+++ b/src/arenas/tron/act.php
@@ -11,9 +11,35 @@
 # -- END LICENSE BLOCK -----------------------------------------
 
 require_once(__DIR__."/functions.php");
+
+
 switch ($_POST['act']){
   case "initGame":
   
+    //check if bots exists
+    $bots=get_Bots_Array('tron');
+
+    $bot1Exists = false;
+    $bot2Exists = false;
+    foreach($bots as $bot){
+	if($bot['id'] == $_POST['bot1']){
+	    $_SESSION['bots'][]=new TronPlayer($bot['id']);
+	    $bot1Exists =true;
+	}
+	if($bot['id'] == $_POST['bot2']){
+	    $_SESSION['bots'][]=new TronPlayer($bot['id']);
+	    $bot2Exists =true;
+	}
+	if ($bot1Exists && $bot2Exists){
+	    break;
+	} 
+    }
+    if ((!$bot1Exists) OR (!$bot2Exists)){
+	error (500,"missing parameter 2");
+    }
+    
+    echo "plop";
+  
   
     break;
   default: