Cannot redeclare the_title()

I was in the middle of updating a post when this error appeared:

Fatal error: Cannot redeclare the_title() (previously declared in /home/xxxxxx/emocrap.com/blog/wp-includes/post-template.php:43) in /home/xxxxxx/emocrap.com/blog/wp-includes/post-template.php on line 723

I can’t access the admin panel to disable any addons, etc.

I checked in Post-template and this is 711 to 723

function the_title($before = '', $after = '', $echo = true) {
	$title = get_the_title();
	if ( strlen($title) == 0 )
		return;
	$title = $before . $title . $after;
	if ( $echo )
		echo $title;
	else
		return $title;
}

[Please post code snippets between backticks or use the code button.]

I’ve never altered this code in my life.

I can’t find much about this other than PHP coding help, but I didn’t code this, any help is appreciated