Overflowing constantly

SELECT * FROM gallery2 WHERE topic_id="828545" UNION SELECT * FROM gallery2 WHERE topic_id="1786555" UNION SELECT * FROM gallery2 WHERE topic_id="1401314" UNION SELECT * FROM gallery2 WHERE topic_id="950515" UNION SELECT * FROM gallery2 WHERE topic_id="189103" UNION SELECT * FROM gallery2 WHERE topic_id="1107218" UNION SELECT * FROM gallery2 WHERE topic_id="1011920" UNION SELECT * FROM gallery2 WHERE topic_id="1802203" UNION SELECT * FROM gallery2 WHERE topic_id="1650329" UNION SELECT * FROM gallery2 WHERE topic_id="535306" UNION SELECT * FROM gallery2 WHERE topic_id="1558945" UNION SELECT * FROM gallery2 WHERE topic_id="702033" UNION SELECT * FROM gallery2 WHERE topic_id="754300" UNION SELECT * FROM gallery2 WHERE topic_id="1528544" UNION SELECT * FROM gallery2 WHERE topic_id="440218" UNION SELECT * FROM gallery2 WHERE topic_id="1596837"