Deleting deviation records results produces frontend error
When deleting deviation records inside event records, an error is thrown in the backend, e.g. in the month view:
date() expects parameter 2 to be integer, string given in xxxxx/xxxx/typo3conf/ext/cal/Classes/Model/Pear/Date.php on line 249
Only after restoring the deviation record via the wastebasket, the error isn't shown any longer.