Bot discord (node + discord.js) Renvoi d'erreur MP refuser par l'utilisateur

//addrole & delrole
client.on('raw', event => {
    const eventName = event.t;
    if (eventName === 'MESSAGE_REACTION_ADD')
    {
        if (event.d.message_id === '590033047932502017')
        {
            var reactionChannel = client.channels.get(event.d.channel_id);
            if(reactionChannel.messages.has(event.d.message_id))
                return;
            else {
                reactionChannel.fetchMessage(event.d.message_id)
                .then(msg => {
                    var msgReaction = msg.reactions.get(event.d.emoji.name + ":" + event.d.emoji.id);
                    var user = client.users.get(event.d.user_id);
                    client.emit('messageReactionAdd', msgReaction, user);
                })
                .catch(err => console.log(err));
            }
        }
    }
    else if(eventName === 'MESSAGE_REACTION_REMOVE')
    {
        if (event.d.message_id === '590033047932502017')
        {
            var reactionChannel = client.channels.get(event.d.channel_id);
            if (reactionChannel.messages.has(event.d.message_id))
                return;
            else {
                reactionChannel.fetchMessage(event.d.message_id)
                .then(msg => {
                    var msgReaction = msg.reactions.get(event.d.emoji.name + ":" + event.d.emoji.id);
                    var user = client.users.get(event.d.user_id);
                    client.emit('messageReactionRemove', msgReaction, user);
                })
                .catch(err => console.log(err));
            }
        }
    }
});

client.on('messageReactionAdd', (messageReaction, user) => {

    var roleName = messageReaction.emoji.name;
    var role = messageReaction.message.guild.roles.find(role => role.name.toLowerCase() === roleName.toLowerCase());

    if(role)
    {
        var member = messageReaction.message.guild.members.find(member => member.id === user.id);
        if(member)
        {
            member.addRole(role.id);
            client.channels.get("509864489248620547").send(`Rôle ${role} attribué à ${user}`);
            member.createDM().then(channel => {
                channel.send(`Le rôle **${role.name}** vous a bien été attribué`);
            }).catch(console.log(`AddRole ${user} refuse les MP`))
            console.log(`succès. Rôle ajouté.`)
        }
    }
});

client.on('messageReactionRemove', (messageReaction, user) => {

    var roleName = messageReaction.emoji.name;
    var role = messageReaction.message.guild.roles.find(role => role.name.toLowerCase() === roleName.toLowerCase());

    if(role)
    {
        var member = messageReaction.message.guild.members.find(member => member.id === user.id);
        if(member)
        {
            member.removeRole(role.id);
            client.channels.get("509864489248620547").send(`Rôle ${role} retiré à ${user}`);
            member.createDM().then(channel => {
                channel.send(`Le rôle **${role.name}** vous a bien été retiré`);
            }).catch(console.log(`DelRole ${user} refuse les MP`))
            console.log("succès. Rôle retiré.")
        }
    }
});

AddRole <@270748295725318144> refuse les MP
botexp.js:105
succès. Rôle ajouté.
botexp.js:106

(node:19504) UnhandledPromiseRejectionWarning: DiscordAPIError: Cannot send messages to this user
    at item.request.gen.end (d:\Bibliothèques\Desktop\Fences\4-Codage\Site Web\Bot Discord\BotExp\node_modules\discord.js\src\client\rest\RequestHandlers\Sequential.js:85:15)
    at then (d:\Bibliothèques\Desktop\Fences\4-Codage\Site Web\Bot Discord\BotExp\node_modules\discord.js\node_modules\snekfetch\src\index.js:215:21)
    at process._tickCallback (internal/process/next_tick.js:68:7)
warning.js:18
(node:19504) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
warning.js:18
(node:19504) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
warning.js:18