mysql - 更新后MYSQL触发器出错

Question

嗨，我的 mysql 触发器有问题，这是我的代码，出现的错误是：Error1064：您在插入附近的 MYSQL sintax 中有错误...

CREATE TRIGGER TRIGGER_HISTORIALES AFTER UPDATE ON BOARD
    FOR EACH ROW BEGIN 
    IF (OLD.IMEI != NEW.IMEI)
    INSERT INTO HISTORIAL_CAMBIO_IMEI (HISTORIAL_CAMBIO_ID,FECHA,BOARD_ID,IMEI_ANTERIOR,IMEI_NUEVO)
    VALUES
    (NULL,SYSDATE(),SELECT BOARD_ID FROM BOARD WHERE IMEI=OLD.IMEI,SYSDATE(),OLD.IMEI,NEW.IMEI);
    END IF
    END