How to fix a command that makes a rainbow role?

Question

Node.js

module.exports.run = async(bot, message, args) => {

    if(!message.guild.member(bot.user).hasPermission('MANAGE_ROLES')) return;
    var colors = ['#FF0000','#FF7F00','#FFFF00','#0000FF','4B0082','#8F00FF'];
    for(let i = 0; i<= colors.length;i++){
        var role = message.guild.roles.find(role => role.name === "Welcome");
        setInterval(() => {
            role.edit({
                color: colors[i]
            })
        }, 5000);
      }
    }
    
    module.exports.help = {
        name: 'rainbowrole'
    }

TypeError: Cannot read property 'edit' of null - Error
Please help me fix it

Answer 1

Discord simply doesn't allow people/bots to change roles if they send too many role change requests.
You can use different accounts, just change them periodically, but it’s better, of course, not to violate the terms of use.