[Plugin: Contact Form 7] Fatal error: Call to a member function add_shortcode()

I’ve been using Contact Form 7 for years, however just recently it conflicts with Portable phpMyAdmin and throws the following error in: Portable PMA

Fatal error: Call to a member function add_shortcode() on a non-object in /homepages/12/d107652008/htdocs/new/wp-content/plugins/contact-form-7/includes/shortcodes.php on line 174

function wpcf7_add_shortcode( $tag, $func, $has_name = false ) {
	global $wpcf7_shortcode_manager;

	return $wpcf7_shortcode_manager->add_shortcode( $tag, $func, $has_name );
}

http://wordpress.org/extend/plugins/contact-form-7/