[Bug 1846423]

[Kalle Werning]

In my case the error is now: "item.startDate is null".
If someone is following here with the same problems with nextcloud, here I opened a new bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1721085

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https://bugs.launchpad.net/bugs/1846423

Title:
  Lightning: Cannot dismiss reminders. Got a VALUE parameter with an
  illegal type for property: VALUE=DURATION

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