리스트 이동 시 창 에러 발생

다른 쪽은 모두 정상인데.... 로그인, 글 작성,수정 후, 리스트 창으로 이동 시 서버 에러가 나오는데,,, 원인을 못 찼겠습니다.

@blueprint.route("/list")
def lists():
    page = request.args.get("page", 1, type=int)
    limit = request.args.get("limit", 10, type=int)

    search = request.args.get("search", -1, type=int)
    keyword = request.args.get("keyword", "", type=str)

    query = {}
    search_list = []

    if search == 0:
        search_list.append({"title": {"$regex": keyword}})
    elif search == 1:
        search_list.append({"contents": {"$regex": keyword}})
    elif search == 2:
        search_list.append({"title": {"$regex": keyword}})
        search_list.append({"contents": {"$regex": keyword}})
    elif search == 3:
        search_list.append({"name": {"$regex": keyword}})

    if len(search_list) > 0:
        query = {"$or": search_list}

    board = mongo.db.board

    datas = board.find(query).skip((page-1) * limit).limit(limit)

    #tot_count = board.find(query).count()
    tot_count = board.count_documents(query)
    last_page_num = math.ceil(tot_count / limit)
    

    block_size = 5
    block_num = int((page-1) / block_size)
    block_start = int((block_size * block_num) + 1)
    block_last = math.ceil(block_start + (block_size-1))

    
    return render_template("list.html", 
                            datas=datas, 
                            limit=limit, 
                            page=page,
                            block_start=block_start,
                            block_last=block_last,
                            last_page=last_page_num,
                            search=search,
                            keyword=keyword,
                            title="리스트",
                            )