diff --git a/lib/dao.js b/lib/dao.js
index 1c18853c..b172298c 100644
--- a/lib/dao.js
+++ b/lib/dao.js
@@ -469,6 +469,7 @@ DataAccessObject.findOne = function findOne(params, cb) {
         cb = params;
         params = {};
     }
+    params = params || {};
     params.limit = 1;
     this.find(params, function (err, collection) {
         if (err || !collection || !collection.length > 0) return cb(err, null);