Mailto link makes page go blank

I have two “mailto:” links. One in a widget, the other in a contact form. In both cases, the link works as it should, opening an email form in a new window. But in both cases, the webpage itself goes blank. Any suggestions on what the cause might be and how to correct?

Widget code is:
<em>Site Design: <a href="mailto:myemail@myemail.com">My Name</a></em>

Contact form code is:
Email: <a href="mailto:<?php echo do_shortcode( stripslashes( of_get_option("contact_line1") ) ); ?> "><?php echo do_shortcode( stripslashes( of_get_option("contact_line1") ) ); ?></a>

Thanks!