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 '92'') limit 1' at line 5
in:
[select p2c.categories_id, p.master_categories_id
from products p, products_to_categories p2c
where p.products_id = '434'
and p.products_id = p2c.products_id
and (p.master_categories_id = '92'' or p2c.categories_id='92'') limit 1]