'Unable to proceed because of an error from the data source' error when unselecting all items in a filter

Hi.

Users get an error (screenshot attached) when unselecting 'All' in the filter (screenshot 2). The filter itself is a calculated field that looks like this:

IF NOT ISNULL([some_value])
THEN [owner_type1]
ELSE [owner_type2]
END

The error occurs only on the server. When doing the same on the desktop, there is no error.

The error just disappears after clicking the 'Try again' button, and all the charts on the dashboard are empty as expected.

The behavior of the dashboard itself seems ok to me, however, this error message is just bothering the users.

What can be done to get rid of it?