Hi,
just to let you know, I had the same issue, and even with PHP 5.6 the problem wasn’t solved.
Theme is Twenty Fourteen
WP: 4.7.2
PHP: 5.6.21
I downloaded the old version of the plugin and changed, on my FTP, actually only the folders mentioned in the previous solution (because I have a very slow internet).
I won’t update this plugin before being sure that the problem is natively solved.
Regards,
David