Invalid SQL: SELECT a.id AS question_number, a.issue_id AS issue_id, a.comment1 AS comment1, a.comment2 AS comment2, a.question AS question, a.question_ua AS question_ua, a.answer AS answer, a.block_name_id AS block_name_id, b.name AS block_name, e.author AS expert,a.author AS author,a.post AS post FROM answer a, expert e, block_name b WHERE a.id=5136  AND a.expert_id=e.id AND a.block_name_id=b.id