Problem with .add_roles() in discordpy?

Question

Python

@bot.command(pass_context=True)
async def buyrole(ctx, role: discord.Role = None):
with connect.cursor() as cursor:
icon = sql.get_money(ctx.guild.id)
if role is not None :
print(role.id)
cursor.execute(f"SELECT cost FROM roleshop WHERE role_id = {role.id} and server_id = {ctx.guild.id}")
price = cursor.fetchone()[0]
if price:
cursor.execute(
f"SELECT shadow_card FROM users WHERE id = {ctx.author.id} and server_id = {ctx.guild.id}")
balance = cursor.fetchone()[0]
if balance >= price and role not in ctx.author.roles:
cursor.execute(
f"UPDATE users SET shadow_card = shadow_card - {price} WHERE id = {ctx.author.id} and server_id = {ctx.guild.id}")
embed = discord.Embed(
title=" BuyRole",
description=f"You bought role ``{role}`` for ``{price}`` {icon}",
colour=discord.Color.green()
)
await ctx.author.add_roles(role)
else:
embed = discord.Embed(
title=" BuyRole",
description="**You don't have enough funds or you have this role!**",
color=discord.Color.red()
)
else:
embed = discord.Embed(
title=" BuyRole",
description="**This role is not for sale!**",
color=discord.Color.red()
)
else :
embed = discord.Embed(
title=" BuyRole",
description=f"**Enter the role you want to buy**\nExample: ``{p}buyrole @FullStack``",
color=discord.Color.red( )
)
connect.commit()
embed.set_footer(icon_url=ctx.author.avatar_url, text=f"Requested {ctx.author}")
await ctx.send(embed=embed)

The problem is await ctx.author.add_roles(roles) when I I delete the command works stably.

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