Unknown column 'cache' in 'field list' query

When I tried to add a component to the MediaWiki filter, I got:

user warning: Unknown column 'cache' in 'field list' query: UPDATE flexifilters SET label = 'Mediawiki Format', description = 'This is an example format which provides a wikimedia-style input format.', pid_root = 1, advanced = 1, cache = 0 WHERE fid = 1 in /f1/content/housing/public/sites/all/modules/flexifilter/flexifilter.module on line 516.

Drupal 6.2. The MediaWiki filter was in use by one of the input filters when I did this, but no-one was accessing any page at that time.