From 537a70611f387a7dc88551d58290eb189b531462 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20Ka=CC=88fer?= <github@kkaefer.com>
Date: Tue, 28 Jun 2011 23:44:44 +0200
Subject: [PATCH] don't call the callback twice in case it fails

---
 lib/mbtiles.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/mbtiles.js b/lib/mbtiles.js
index f29ad34..4b7a54f 100644
--- a/lib/mbtiles.js
+++ b/lib/mbtiles.js
@@ -253,10 +253,11 @@ MBTiles.prototype.grid = function(x, y, z, callback) {
                         memo[r.key_name] = JSON.parse(r.key_json);
                         return memo;
                     }, {});
-                callback(null, _(JSON.parse(grid)).extend({ data: data }));
             } catch (err) {
-                callback('Grid is invalid');
+                return callback('Grid is invalid');
             }
+
+            callback(null, _(JSON.parse(grid)).extend({ data: data }));
         }
     );
 };