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After you have backed up your database, you can try to run this in the Tools ... Install SQL Patches ...
Code:
INSERT INTO categories (categories_id, categories_image, parent_id, sort_order, date_added, last_modified, categories_status) VALUES (1, '', 0, 1, '2009-11-06 00:00:00', '2009-11-06 00:00:00', 1);
INSERT INTO categories_description (categories_id, language_id, categories_name, categories_description) VALUES (1, 1, 'Test Category', 'Work around for missing categories');
UPDATE products_to_categories SET categories_id = 1;
UPDATE products SET master_categories_id = 1;
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