Just got the same error:
PHP Fatal error: 1062uplicate entry '0-1' for key 'PRIMARY' :: insert into zen_products_description

1.55f site had been hacked and the entire zen_products table was rewritten, index dropped and many product fields were added.

Fix was to remove the extra fields, export the db, repair the table structure, auto increment, index and fix any original product data that was also changed.

Imported the db once it was clean and checked the fileset and images for any signs of further tampering. Working now but there's a site upgrade on the horizon, suspect the host was also hacked for number of other problems leading up to this error.