ERROR 1054 (42S22): Unknown column 'X' in 'NEW' in trigger

CREATE TABLE t1 ( m set('sms') NOT NULL);

CREATE TABLE t2 (i int);

CREATE TABLE u (i int);

 create or replace trigger t1 AFTER INSERT ON t1 FOR EACH ROW INSERT IGNORE INTO t2 SELECT u.i from u JOIN (SELECT 'sms' AS method) m ON FIND_IN_SET(m.method, NEW.m);

insert into t1 values ('sms');

ERROR 1054 (42S22): Unknown column 'm' in 'field list'