我不断收到有关 discord.js 中 .position 的错误

Question

So i tried making a kick command in dicors.js(creating a bot). I did a little bit of research and I ended up with copying a code from stack overflow. The code was working fine but i wanned to make it so if "x" that has a lower rank tries to kick "y" which has higher rank, the bot would then send a message to "x" that he can't kick a higher rank person. (both x and y are users)

The code that i copied also has this function included and i keep getting this error

let authorHighestRole = msg.member.highestRole.position;
                                               ^
TypeError: Cannot read property 'position' of undefined

I searched online: nothing. I tried some stupid things like adding () to .position I searched in the Discord.js docs and still nothing.

I came to the conclusion that the code is old.

Here is my code

case 'kick' :
            if(msg.channel.type === 'DM') {
                msg.channel.send('This command can use only in guide');
                return;
            };
    
            if(!msg.member.hasPermission('KICK_MEMBERS')) {
                msg.channel.send('You have no permissions to do that');
                return;
            };
    
            let mentionMember = msg.mentions.members.first();
            if(!mentionMember) {
                msg.channel.send('Please specify the person you want to kick!');
                return;
            }
    
            if(!mentionMember.kickable) {
                msg.channel.send('I can\'t kick this user!');
                return
            };

            //Get the highest role of user for compare
            let authorHighestRole = msg.member.highestRole.position;
            let mentionHighestRole = mentionMember.highestRole.position;

            //If mention user have same or higher role, so show this error msg
            if(mentionHighestRole >= authorHighestRole) {
                msg.channel.send('You can`t kick members with equal or higher position');
                return;
            };
        
            mentionMember.kick()
                msg.channel.send(`${mentionMember.displayName} was kicked`)
        break;

Any help would be appreciated.

Answer 1

member doesn't contain a property called highestRole, I believe the property you're looking for is: member.roles.heighest.

see docs: https://discord.js.org/#/docs/main/stable/class/GuildMemberRoleManager?scrollTo=highest

msg.member.roles.highest.position