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Error : TypeError: mktime(): Argument #4 ($month) must be of type ?int, string given

Backtrace:
/modules/extcal/class/pear/Calendar/Engine/UnixTS.php (187)
/modules/extcal/class/pear/Calendar/Table/Helper.php (267)
/modules/extcal/class/pear/Calendar/Week.php (139)
/modules/extcal/view_week.php (114)