Upgrade error from 3.20 to 3.22

I've been performing the 3/4/15 security update on various sites, some using 7.3 and other using 7.4. On a site with 7.30, I get the error below when I try to upgrade to 3.22 using drush (identifying text replaced with [db] and [site] placeholders).

This is occurring only on this particular site, although I have a few more to go - otherwise, the updates have proceeded without incident.

Any ideas? Thanks in advance...

WD menu: PDOException: SQLSTATE[42S02]: Base table or view not found:[error]
1146 Table '[db].cache_page' doesn't exist: DELETE FROM
{cache_page} 
WHERE  (expire  :db_condition_placeholder_0) AND (expire <
:db_condition_placeholder_1) ; Array
(
    [:db_condition_placeholder_0] => 0
    [:db_condition_placeholder_1] => 1425562728
)
 in cache_clear_all() (line 167 of
/home/[site]/public_html/includes/cache.inc).
SQLSTATE[42S02]: Base table or view not found: 1146 Table            [error]
'[db].cache_page' doesn't exist
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