From 6ccb6e4094ee7ac8ac87f8ce0394f39cbc937a8c Mon Sep 17 00:00:00 2001
From: gretacb <carol@mapbox.com>
Date: Thu, 21 Apr 2016 15:06:01 -0400
Subject: [PATCH] gracefully handle Mapnik errors when creating VT

---
 index.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 50d1c60..af99784 100644
--- a/index.js
+++ b/index.js
@@ -242,7 +242,7 @@ Bridge.getVector = function(source, map, z, x, y, callback) {
         // are out of bounds at zoom-level z
         var vtile = new mapnik.VectorTile(+z,+x,+y, {buffer_size:16*map.bufferSize});
     } catch(err) {
-        return callback(err, null, headers);
+        return callback(invalid(err.message, null, headers));
     }
     
     map.extent = vtile.extent();
@@ -465,3 +465,9 @@ Bridge.prototype.getIndexableDocs = function(pointer, callback) {
         feature();
     });
 };
+
+function invalid(msg) {
+    var err = new Error(msg);
+    err.code = 'EINVALID';
+    return err;
+}