Plan manager does not load on the first time

[blcham]

When I enter page of plan-manager it acts like it is loading the page, but this never finishes. This is how it looks:

In development console I get following error.

nonIterableSpread.js:2 Uncaught (in promise) TypeError: Invalid attempt to spread non-iterable instance.
In order to be iterable, non-array objects must have a [Symbol.iterator]() method.
    at nonIterableSpread.js:2:9
    at a (toConsumableArray.js:6:95)
    at PlanManager.tsx:64:26
    at d (regeneratorRuntime.js:44:17)
    at Generator.<anonymous> (regeneratorRuntime.js:125:22)
    at Generator.next (regeneratorRuntime.js:69:21)
    at r (asyncToGenerator.js:3:20)
    at u (asyncToGenerator.js:22:9)

Plan loads correctly if I refresh the page by F5.

[blcham]

This can be simulated very easly:

1. open annonymous window and enter https://kbss.felk.cvut.cz/csat/plan-manager/