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Avoid errors if $instance_date is not passed correctly
(thanks, Scrutenizer)
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@ -1920,7 +1920,7 @@ class calendar_boupdate extends calendar_bo
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foreach($event['alarm'] as &$alarm)
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{
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if($event['recur_type'] != MCAL_RECUR_NONE)
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if($event['recur_type'] != MCAL_RECUR_NONE && is_object($instance_date))
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{
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calendar_so::shift_alarm($event, $alarm, $instance_date->format('ts'));
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}
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