'undefined' Error When Mobile Users Submit Form

Hi there,

When people submit a CCF Form from a mobile phone the form does not come through at all and the user gets a plain, white page with ‘undefined’ in the top left corner. Is there a quick fix for this?

One of the forms this issue is happening with is here:
http://www.portraits.sassiphotography.com.au/contact

I’ve searched through the existing questions and have not found any solution yet. Please help.

https://wordpress.org/plugins/custom-contact-forms/