Deploying Google Cloud Functions ResponseError: The updateMask field contains event_trigger but it is not present in CloudFunction resource

I just started getting an error when trying to deploy a google cloud HTTP function using:

gcloud functions deploy http_function --trigger-http

And now I'm getting an error like this:

ERROR: (gcloud.functions.deploy) ResponseError: status=[400], code=[Bad Request], message=[The request has errors
Problems:
The updateMask field contains event_trigger but it is not present in CloudFunction resource.
]

The function deployed fine earlier and I've only fiddled with the some code inside, nothing that I believe should give me this error.

My cloud function looks like this:

exports.http_function = (req, res) => {
    if (req.method === 'POST') {
        // some code and then
        res.json(jsonVariable);
    } else {
        const error = new Error('Only POST requests are accepted');
        error.code = 405;
        console.error(error);
        res.status(error.code || 500).send(error);
        throw error;
    }
}

If anyone has some insight as to what might cause this error, I'd greatly appreciate it, because I'm struggling to find info on it?

EDIT: It only seems to happen sometimes, so now I definitely believe it's something wrong with gcloud.