discord.py – In embed.fields.0.value: This field is required error

@client.command()
async def hug(ctx, *, user: discord.Member = None):

    hug_embed = discord.Embed(title='-w- hug -w-', description='', color=0xafe8fa)
    hug_embed.add_field(name=f'{ctx.author.mention} hugged {user.mention}', value='', inline=False)

    if user:
        await ctx.message.channel.send(embed=hug_embed)
    else:
        await ctx.send('hug someone ;n;')

I got the error of
In embed.fields.0.value: This field is required

how do i mention another person, with it sending in an embed response