{"Error":"An item with the same key has already been added. Key: 9b11c943c7db3d17ffd1ba9d9da48889","StackTrace":"   at System.Collections.Generic.Dictionary\u00602.TryInsert(TKey key, TValue value, InsertionBehavior behavior)\n   at Bulev.Library.Products.BookmarksRepository.AddAsync(Sessions session, Int64 productid) in E:\\_disk c\\_work\\_projects\\ZigZagDom\\Bulev.Library.Products\\Bulev.Library.Products\\Repositories\\BookmarksRepository.cs:line 34\n   at Bulev.Library.Products.BookmarksIM.Add(BaseController controller) in E:\\_disk c\\_work\\_projects\\ZigZagDom\\Bulev.Library.Products\\Bulev.Library.Products\\Models\\Bookmarks.cs:line 51"}