Cannot read properties of undefined (reading ‘bannable’)

    message.mentions.members.forEach(men => {
      let member = message.mentions.members.get(men)

      if (!member.bannable) return message.reply(not_bannable)
    
      const reason = args.slice(1).join(" ");
      member.ban({reason: reason || "no reason"}).then((member) => {
        message.channel.send(member + " banned by " + message.author.id)
      }).catch(err => console.log(err))
  })

I’m trying to build a ban command that allows you to ban multiple users at once. Unfortunately, an error occurs when I execute it.

I work with discord v13

Why does this error occur?

Cannot read properties of undefined (reading 'bannable')