Error during rating

Hi,
I work on Joomla 2.5 and Template Hot Drug Store - Vm 2.0.20b

When I test rating I get this error:

vmError: VirtueMartModelRatings::Error store rating TableRatings: :store nije uspelo
Duplicate entry '85-1' for key 'i_virtuemart_product_id' SQL=UPDATE `plv5p_virtuemart_ratings` SET `virtuemart_product_id`='85',`rates`='5',`ratingcount`='1',`rating`='5',`published`='0',`created_on`='2012-08-10 09:20:35',`created_by`='42',`modified_on`='2013-06-18 15:13:24',`modified_by`='42' WHERE `virtuemart_rating_id`='1'

Can you help me with this.
Thank you.

When you go to Extension Manager, "Database" tab do you maybe have some option saying something like "click here to repair database...". If yes click on it.