Database errors if specific guild doesn't exist - node.js

Question

I have per guild settings on my discord bot. However, for some reason if the guild doesn't exist it errors. I have over 150 guilds that my bot is in, and this was only recently added. I don't know what to do to make it work ...
I have tried different methods of calling if the data is null but I always get an error and end up with this original chunk of code
client.updateGuild = async (guild, settings) => {
let data = await client.getGuild(guild);
if (typeof data !== 'object') data = {};
for (const key in settings) {
if (data[key] !== settings[key]) data[key] = settings[key];
else return;
}
console.log(`Guild "${data.guildName}" updated settings: ${Object.keys(settings)}`);
return await data.updateOne(settings);
};
If the guild does not exist it should make a new entry for the guild and save the updated config settings when someone runs the config command
client.createGuild = async settings => {
const defaults = Object.assign({ _id: mongoose.Types.ObjectId() }, client.config.defaultSettings);
const merged = Object.assign(defaults, settings);
const newGuild = await new Guild(merged);
return newGuild.save()
.then(console.log(`Default settings saved for guild "${merged.guildName}" (${merged.guildID})`));
};
This is the command run when it is added to a guild after the update, but like I said theres over 150 old ones ;-;

Answer 1

If I understand it right, the problem is somewhere here:
return await data.updateOne(settings);
data should be an actual collection/model and according to let data = await client.getGuild(guild); it should return a model, but I'm 99% sure that it's not. Well, I don't see what client.getGuild does, so.. that's why I'm sure only for 99%
The second vector of the problem lies here, settings object should be equal to these schema: {filter_field: value},{update_field: value},{upsert:true} and as a result:
... = await model_name.updateOne({filter: value},{update: field},{upsert:true}).exec(callback)
And for the more, if you want to:
I need the updateGuild function to run the createGuild function if there is no database entry
I guess that updateGuild inside, should looks like this, w/o createGuild method:
let result = await model_name.findOneAndUpdate(
{
fieldName: filterValue,
},
new Class(object),
{
upsert : true,
new: true,
setDefaultsOnInsert: true,
runValidators: true,
lean: true
}
).exec();
in that case, result variable have updated docs data, and some values could be displayed to the user of the bot, via destructive method if it succeeded.
Or trigger await createGuild(); directly, in updateGuild without upside code snippet if it allows to.