diff --git a/src/JobManager.js b/src/JobManager.js
index 7c1d0b2..1ac8ce5 100644
--- a/src/JobManager.js
+++ b/src/JobManager.js
@@ -5,6 +5,7 @@ var utils = require('./utils');
 var STATE = utils.createEnum([ 'RUNNING', 'PAUSED', 'NOT_RUNNING']);
 
 function JobManager(opts){
+    opts = opts || {};
 
     //opts
     this.notifyAt = opts.notifyAt|| 3;