Uncaught TypeError: Cannot add property _weekdaysMinRegex, object is not extensible

[evehmane]

This happens sometimes on resource page, right after creating a reservation (when user is redirected to resource page). I think it's inside DateSelector component.

[evehmane]

This only happens to me on localhost.

Steps to reproduce:

• Go to front page (on localhost)
• Click some free slot on a timeline to end up in reservation create page with some datetime in url
• Refresh page
• Fill and save the form (EDIT: another way is to just go to the front page again by clicking link in top bar)

What should happen:

• User should be redirected to resource page and "reservation success modal" should be shown

What actually happens:

• Url is changed to resource page url but the error occurs before anything is rendered, so user still sees the reservation form

The error occurs in moment.js's code and it's probably related to date pickers. If user has already been in some other page before reservation create page (in other words, if you don't refresh the page in the steps to reproduce), this error does not occur.