From 4d1242c9bcd831fa3333c3e9c73a08759741734c Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Wed, 20 May 2020 20:33:27 -0700
Subject: [PATCH] Avoid an undefined reference when handed an unknwown game ID

We're on our way to a clean 404 error, but we don't want to
hit a JavaScript error along the way.
---
 lmno.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lmno.js b/lmno.js
index fbef78f..65c317d 100644
--- a/lmno.js
+++ b/lmno.js
@@ -133,11 +133,15 @@ app.use('/empires/:game_id([a-zA-Z0-9]{4})', (request, response, next) => {
     return;
   }
 
-  request.game = lmno.ids[game_id].game;
-  if (request.game === undefined) {
+  /* See if there is any game with this ID. */
+  const game = lmno.ids[game_id];
+  if (game === undefined) {
     response.sendStatus(404);
     return;
   }
+
+  /* Stash the game onto the request to be used by the game-specific code. */
+  request.game = game.game;
   next();
 });
 
-- 
2.43.0