diff --git a/conception/th_sendImageAndPosition.txt b/conception/th_sendImageAndPosition.txt
index 04e9aaa..7b35fb5 100644
--- a/conception/th_sendImageAndPosition.txt
+++ b/conception/th_sendImageAndPosition.txt
@@ -12,7 +12,7 @@ while ()
           :MessagePosition msgToSend=new MessagePosition(MESSAGE_CAM_POSITION,position);
           :messageToMon!msgToSend;
       endif
-      if (arena)then(null)
+      if (arena)then(nullptr)
       else
           :image.DrawArena(arena);
       endif