Nicolas Juen

Hi !
I have the same issue because I develop with WP_DEBUG at true, you can fix this like this :

function increment_views() {
	global $wpdb;
	if( !isset($_GET['postviews_id'] ) )
		return false;
	$post_id = intval($_GET['postviews_id']);
	if($post_id > 0 && defined('WP_CACHE') && WP_CACHE) {
		$post_views = get_post_custom($post_id);
		$post_views = intval($post_views['views'][0]);
		if(!update_post_meta($post_id, 'views', ($post_views+1))) {
			add_post_meta($post_id, 'views', 1, true);
		}
	}
}

Seems to work and not blocking the plugin 🙂