Tracker Domain Error after update to 4.9

I am getting the below error aftr updating Matomo to V 4.9
WARNING: /plugins/TrackerDomain/TrackerDomain.php(106): Notice - Undefined index: url - Matomo 4.9.0 - Please report this message in the Matomo forums: (please do a search first as it might have been reported already) (Module: MultiSites, Action: index, In CLI mode: false)

Most of the time, when such kind of error occurs (missing index or table column), the source of the problem is an unfinished update…
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