diff --git a/lib/providers/filesystem/index.js b/lib/providers/filesystem/index.js
index a941587..cb71d98 100644
--- a/lib/providers/filesystem/index.js
+++ b/lib/providers/filesystem/index.js
@@ -99,6 +99,7 @@ FileSystemProvider.prototype.getContainers = function(cb) {
   fs.readdir(self.root, function(err, files) {
     var containers = [];
     var tasks = [];
+    var files = files || [];
     files.forEach(function(f) {
       tasks.push(fs.stat.bind(fs, path.join(self.root, f)));
     });