Discord.Js The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined - discord.js

Question

I was coding a new command on discord which its focusing on OsuApi and now what I did is making a data function that writes the info on the Api.
I tried this code and it seems that I cannot fix it because I'm kinda new to this function and its bugging me
and here's my code
const { member, channel, content, guild } = message
const cache = {}
let data = cache[member.id]
if (!data) {
const e1 = new ME()
.setTitle(`Fetching Data Please Wait`)
.setColor("Random")
.setTimestamp()
.setFooter({ text: client.user.username, iconURL: client.user.displayAvatarURL() })
console.log("Fecting From DataBase")
const msg = await channel.send({ embeds: [e1] })
await shi().then(async mongodb => {
try {
const result = await us.findOne({ _id: member.id })
if (!result) {
const e2 = new ME()
.setTitle("Aweeee~")
.setColor(config.colors.no)
.setDescription("No user found set user using 's!setuser <username or userid>' ")
.setTimestamp()
.setFooter({ text: client.user.username, iconURL: client.user.displayAvatarURL() })
await setTimeout(() => {
msg.edit({ embeds: [e2] })
}, 5000);
return
}
cache[member.id] = data = [result.text]
} catch (err) {
console.log(err)
message.channel.send("Something bad happened sorry")
}
})
api.user
.get(data)
.then(data => {
const dataJSON = JSON.stringify(data)
fs.writeFileSync('user.json', dataJSON)
const dataBuffer = fs.readFileSync('user.json')
const stringJSON = dataBuffer.toString()
const parseDATA = JSON.parse(stringJSON)
console.log(parseDATA.username)
channel.send("testing")
})
}