Exception: Argument passed must be of the type string, null given

Describe the bug
After updating Bookmarks to version 3.0 my Nextcloud log tells me that every Floccus sync produces this error:

Exception: Argument 2 passed to OCA\Bookmarks\Db\SharedFolderMapper::findByFolderAndUser() must be of the type string, null given, called in bookmarks/lib/Service/HashManager.php on line 136

Since the error didn't occur with Bookmarks v2.3.4 I thought at first the error has to be caused by the NC Bookmarks app.
BUT the iOS App nextBookmark produces no such errors.
If I'm wrong and the problem is exclusively caused by the new version of Bookmarks please let me know.

To Reproduce
Just update the NC bookmarks app to v3.0 final and sync your Firefox using Floccus.

Expected behavior
No error log entries.

Desktop (please complete the following information):

• OS: macOS
• Browser: Firefox 75.0
• Floccus version: 4.1.0
• Floccus sync method: Nextcloud Bookmarks (the first one)
  Path prefix for server folder was and is empty.

Server (please complete the following information):

• Nextcloud version: 18.0.4
• Bookmarks app version: 3.0 final

[marcelklehr]

It is indeed a bookmarks app bug. I will release a fix shortly.

[marcelklehr]

You can update the bookmarks app now :)

Thanks, I did. There's a new error message now using v3.0.2:

Exception: Call to undefined method OCA\Bookmarks\Service\Authorizer::userId()

details in my comment here

[github-actions]

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