Module Entry in system table prevents D7 update

Ignore the versions selected here. I'm trying to do an upgrade from D6 to D7 and there is an entry in the "system" table with a type of "javascript library" which seems to come from this module.

System update 7018 has the following line

db_change_field('system', 'type', 'type', array('type' => 'varchar', 'length' => 12, 'not null' => TRUE, 'default' => ''));

This fails due the fact it would truncate this data.

Is this entry safe to delete prior to D7 update?

Chris