View definition corruption

CREATE TABLE `test_table` (`ID` INTEGER(0)) ENGINE=MyISAM;

CREATE VIEW `test_view` AS SELECT * FROM `test_table` WHERE ISNULL(ID)=0;

SHOW CREATE VIEW test_view;

+-----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+

| View      | Create View                                                                                                                                                                           | character_set_client | collation_connection |

+-----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+

| test_view | CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `test_view` AS select `test_table`.`ID` AS `ID` from `test_table` where `test_table`.`ID` is null = 0 | latin1               | latin1_swedish_ci    |

+-----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '= 0' at line 1