Reaction Error

let lastNumb = 0;

client.on("messageCreate", msg => {
    const num = Number(msg.content)
    if (num >= 0) {
        
        if (num == lastNumb + 1) {
            msg.react(":white_check_mark:")
            lastNumb += 1
        } else {
            msg.reply(`uh oh we lost it at: ${lastNumb}`)
        }


    } else if (num < 0) {
        msg.reply("invalid number")
    }
    
});