diff --git a/src/serve_data.js b/src/serve_data.js
index dbab4a6..e7f502a 100644
--- a/src/serve_data.js
+++ b/src/serve_data.js
@@ -19,6 +19,10 @@ module.exports = function(options, repo, params, id) {
 
   repo[id] = tileJSON;
 
+  var mbtilesFileStats = fs.statSync(mbtilesFile);
+  if (!mbtilesFileStats.isFile() || mbtilesFileStats.size == 0) {
+    throw Error('Not valid MBTiles file: ' + mbtilesFile);
+  }
   var source = new mbtiles(mbtilesFile, function(err) {
     source.getInfo(function(err, info) {
       tileJSON['name'] = id;
@@ -28,7 +32,7 @@ module.exports = function(options, repo, params, id) {
 
       tileJSON['tilejson'] = '2.0.0';
       tileJSON['basename'] = id;
-      tileJSON['filesize'] = fs.statSync(mbtilesFile)['size'];
+      tileJSON['filesize'] = mbtilesFileStats['size'];
       delete tileJSON['scheme'];
 
       Object.assign(tileJSON, params.tilejson || {});
diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index 7492659..ef70b97 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -173,8 +173,12 @@ module.exports = function(options, repo, params, id) {
 
       queue.push(function(callback) {
         var mbtilesFile = url.substring('mbtiles://'.length);
-        map.sources[name] = new mbtiles(
-          path.join(options.paths.mbtiles, mbtilesFile), function(err) {
+        mbtilesFile = path.join(options.paths.mbtiles, mbtilesFile);
+        var mbtilesFileStats = fs.statSync(mbtilesFile);
+        if (!mbtilesFileStats.isFile() || mbtilesFileStats.size == 0) {
+          throw Error('Not valid MBTiles file: ' + mbtilesFile);
+        }
+        map.sources[name] = new mbtiles(mbtilesFile, function(err) {
           map.sources[name].getInfo(function(err, info) {
             var type = source.type;
             Object.assign(source, info);