こんにちは、お手伝いできることはありますか?

Liquid error: Solution::ArticleMeta#visible? delegated to solution_folder_meta.visible?, but solution_folder_meta is nil: #<Solution::ArticleMeta id: 36000084198, position: nil, art_type: 1, thumbs_up: 0, thumbs_down: 0, hits: 0, solution_folder_meta_id: 36000192075, account_id: 859387, created_at: "2018-09-07 22:32:05", updated_at: nil, available: nil, draft_present: nil, published: nil, outdated: nil>