Fatal error in comments.php when running Ubermenu

Hi,

I’m a bit stuck, i’m running the latest versions of both CT and the Ubermenu plugin and it’s all of a sudden throwing a fatal error at me:

Fatal error: Cannot redeclare html5_comment() (previously declared in E:\wamp3\www\ges\wp-content\themes\CT\comments.php:5) in E:\wamp3\www\ges\wp-content\themes\CT\comments.php on line 56

They have both run together for over a year with no problem previously. There doesn’t seem to be any obvious double declaration. I tried some basic troubleshooting and temporarily renaming comments.php to comments.php_ resolves the error message, hinting that the problem lies there somewhere.

Have disabled all plugins and identified Ubermenu as the one which triggers it.

I did recently run the WP-Optimize plugin, maybe it has touched something it shouldn’t have.

Google searching this finds a small amount of Premium Press sites also throwing this error.

Any ideas?

CT 8.97
Wordpress 4.8
Ubermenu 3.3
PHP 7.04
MySQL 5.7.11

Thanks,
Matt