[EventCalendar] Column 'category_id' in where clause is ambiguous

[David Bessler]

WordPress database error: [Column 'category_id' in where clause is
ambiguous]
SELECT SQL_CALC_FOUND_ROWS nycvs_posts.* FROM nycvs_posts LEFT JOIN
nycvs_post2cat ON (nycvs_posts.ID = nycvs_post2cat.post_id) LEFT JOIN
nycvs_post2cat ec3_post2cat ON ec3_post2cat.post_id=id WHERE 1=1 AND
category_id IN (15) AND (post_type = 'post' AND (post_status = 'publish'
OR post_status = 'private')) AND ec3_post2cat.category_id!=12 GROUP BY
nycvs_posts.ID ORDER BY post_date DESC LIMIT 0, 100

Just upgraded to php 5.0.4  and now I get this error.  I deactivate all
plugins except EC3, and it still happens.   When I deactivate EC3 it
goes away.  I need help.