(string) 
			SELECT p.playlist_id, p.thumb_id, p.user_id, p.name, p.slug, p.description, p.type, p.rating, p.likes, p.rated_by, p.percent,
			       p.allow_comment, p.total_videos, p.total_views, p.total_comments, p.total_favorites, p.add_time, p.update_time, p.status,
			       v.thumb, v.slug AS video_slug, u.username, GROUP_CONCAT(t.tag) AS tags
			FROM playlist AS p
			LEFT JOIN video AS v ON (v.video_id = p.thumb_id)
			LEFT JOIN user AS u ON (u.user_id = p.user_id)
			LEFT JOIN playlist_tags AS pt ON (pt.playlist_id = p.playlist_id)
			LEFT JOIN tags AS t ON (t.tag_id = pt.tag_id)
			WHERE p.playlist_id = ?
			GROUP BY p.playlist_id
			LIMIT 1
(string) 
			SELECT p.playlist_id, p.thumb_id, p.user_id, p.name, p.slug, p.description, p.type, p.rating, p.likes, p.rated_by, p.percent,
			       p.allow_comment, p.total_videos, p.total_views, p.total_comments, p.total_favorites, p.add_time, p.update_time, p.status,
			       v.thumb, v.slug AS video_slug, u.username, GROUP_CONCAT(t.tag) AS tags
			FROM playlist AS p
			LEFT JOIN video AS v ON (v.video_id = p.thumb_id)
			LEFT JOIN user AS u ON (u.user_id = p.user_id)
			LEFT JOIN playlist_tags AS pt ON (pt.playlist_id = p.playlist_id)
			LEFT JOIN tags AS t ON (t.tag_id = pt.tag_id)
			WHERE p.playlist_id = ?
			GROUP BY p.playlist_id
			LIMIT 1
MySQLi query has prepared entries, but no types or variables specified!