Calendar adds errors to ical components

The iCal components of events get lots of errors added in e.g.
"X-LIC-ERROR;X-LIC-ERRORTYPE=VALUE-PARSE-ERROR:No value for DESCRIPTION
property. Removing entire property:
X-LIC-ERROR;X-LIC-ERRORTYPE=VALUE-PARSE-ERROR:No value for LOCATION
property. Removing entire property:"

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