From b24288b7eff21f6600170431ef4d35312f8387b1 Mon Sep 17 00:00:00 2001
From: Sandro Santilli <strk@keybit.net>
Date: Fri, 10 Aug 2012 19:33:14 +0200
Subject: [PATCH] Have render() catch Reference errors by invoking the user
 callback

---
 lib/carto/renderer.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/carto/renderer.js b/lib/carto/renderer.js
index b0810a8..ab12c79 100644
--- a/lib/carto/renderer.js
+++ b/lib/carto/renderer.js
@@ -22,7 +22,11 @@ carto.Renderer.prototype.render = function render(m, callback) {
         effects: []
     });
 
-    tree.Reference.setVersion(this.options.mapnik_version);
+    try {
+      tree.Reference.setVersion(this.options.mapnik_version)
+    } catch (err) {
+      callback(err, null);
+    }
 
     var output = [];