After an upgrade to 6.0.4 (from 5.5) I have the below issue when opening the upgrade wizard.
I've already run a repair

Query Failed:ALTER TABLE fields_meta_data modify column ext4 NULL ::MySQL error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'NULL' at line 1


What do I need to hack next?