Doesn't display role names in chat, error AttributeError: 'NoneType' object has no attribute 'mention', but id of all roles is displayed. Where is the mistake?

Question

Python

I am making my own economic bot. I created the !sc-shop command, it was to display all the roles from the database. But when it is executed, an error AttributeError: 'NoneType' object has no attribute 'mention' is thrown

@client.command(aliases=['shop'])
async def __shop(ctx):
    embed = discord.Embed(
        title='Магазин',
        description='Здесь вы можете приобрести роль на сервере за **SCoins**',
        color=0xCC33FF
    )

    for row in cursor.execute(f'SELECT role_id, cost FROM shop WHERE id = {ctx.guild.id} ORDER BY cost'):
        embed.add_field(
            name=f'Стоимость: **{row[1]} SCoins**',
            value=f'Роль - {ctx.guild.get_role(row[0]).mention}',
            inline=False
        )

    await ctx.send(embed = embed)

As I understand it, he did not find the role id, so he returns NoneType, and as a result he cannot find mention. But if we rewrite the command so that only the id of the roles would be displayed:

@client.command(aliases=['shop'])
async def __shop(ctx):
    embed = discord.Embed(
        title='Магазин',
        description='Здесь вы можете приобрести роль на сервере за **SCoins**',
        color=0xCC33FF
    )

    for row in cursor.execute(f'SELECT role_id, cost FROM shop WHERE id = {ctx.guild.id} ORDER BY cost'):
        embed.add_field(
            name=f'Стоимость: **{row[1]} SCoins**',
            value=f'Роль - {row[0]}',
            inline=False
        )

    await ctx.send(embed = embed)

Then it will display all the roles with id
Help solve the problem, so that the names of each of the roles would be displayed

Answer 1

Check type(row[0])most likely you store/db returns ID as a string, get_roleaccepts ID asint