TypeError: u.types.isBoxedPrimitive is not a function

I am converting our project from mailgun-js package to mailgun.js package. I am running into this error TypeError: u.types.isBoxedPrimitive is not a function below is how everything is configured.

const formData = require('form-data');
const Mailgun = require('mailgun.js');
const mailgun = new Mailgun(formData);

const data = {
    from: '[e-mail]',
    to: ['[e-mail]'],
    subject: 'subject_line',
    template: 'use_template',
    'h:X-Mailgun-Variables':  
        JSON.stringify({
        firstName: 'TestFirstName',
        lastName: 'TestLastName',})
}

mg.messages.create('MY_DOMAIN', data).catch(err => console.log(err))

Any thoughts on what might be the issue, it must be header related but can’t seem to pinpoint it.

Thanks!

[Keitharuni]

@olexandr-mazepa Going to give this a try again this week, will let you know the results.

[olexandr-mazepa]

It seems like no activity here. I am going to close this issue in a few days because I can’t reproduce this and there is no info that can help me with this.