Advanced Pack: Some Google Calendars are not synchronizing

[dsp]

Some of our Google Calendars are not syncing correctly. The logs contain these two lines for every run:

[2016-05-01 20:30:08] Espo.ERROR: GoogleCalendarERROR: Error when calendar synchronization is running. GoogleCalendarUser Id 571cfb706a8b4b5ce. Message: DateTimeZone::__construct(): Unknown or bad timezone () [] []
[2016-05-01 20:30:09] Espo.ERROR: GoogleCalendarERROR: Error when calendar synchronization is running. GoogleCalendarUser Id 571cfb706d19e99d9. Message: DateTimeZone::__construct(): Unknown or bad timezone () [] []

[yuri]

Hi, We will take a look. Thanks.