diff --git a/src/main.js b/src/main.js
index 74dc667..9790d94 100644
--- a/src/main.js
+++ b/src/main.js
@@ -27,7 +27,8 @@ $.fn.fullCalendar = function(options) {
 		}
 		return this;
 	}
-	
+
+	options = options || {};
 	
 	// would like to have this logic in EventManager, but needs to happen before options are recursively extended
 	var eventSources = options.eventSources || [];