Unable to send invoice from app

When you select the option from sales to send the involve to the customer it does not work. The email client is opened but it displays the email address to as ENTITYEMAIL

The URL that is in the body of the email does not direct to the invoice PDF it is shown as https://secure.clearbooks.co.uk/accounting/sales/invoice_pdf/?source=statement.

I only discovered this issue when I was trying to send an invoice already created from my mobile device