MMM-Pages pages don't switch

[Mrtrol2013]

When switching pages using the notification, an error occurs

Uncaught TypeError: Cannot read property 'toLowerCase' of undefined
    at main.js:430
    at Array.filter (<anonymous>)
    at modulesByClass (main.js:425)
    at Array.exceptWithClass (main.js:408)
    at Class.animatePageChange (MMM-pages.js:220)
    at Class.updatePages (MMM-pages.js:183)
    at Class.notificationReceived (MMM-pages.js:105)
    at sendNotification (main.js:99)
    at Object.sendNotification (main.js:537)
    at Class.sendNotification (module.js:374)

But the page switching notification appears

[sdetweil]

@mrtrol2013 says it is looking for the classname string to use on search