java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at davmail.exchange.VProperty.appendParamValues(VProperty.java:442)
at davmail.exchange.VProperty.toString(VProperty.java:411)
at davmail.exchange.VObject.writeTo(VObject.java:147)
at davmail.exchange.VObject.writeTo(VObject.java:152)
at davmail.exchange.VObject.toString(VObject.java:161)
at davmail.exchange.ews.EwsExchangeSession$Event.getEventContent(EwsExchangeSession.java:1857)
at davmail.exchange.ExchangeSession$Event.getBody(ExchangeSession.java:2468)
at davmail.caldav.CaldavConnection.appendItemResponse(CaldavConnection.java:405)
at davmail.caldav.CaldavConnection.appendEventsResponses(CaldavConnection.java:390)
at davmail.caldav.CaldavConnection.reportItems(CaldavConnection.java:782)
at davmail.caldav.CaldavConnection.handleFolderOrItem(CaldavConnection.java:282)
at davmail.caldav.CaldavConnection.handleRequest(CaldavConnection.java:225)
at davmail.caldav.CaldavConnection.run(CaldavConnection.java:169)

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