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-rw-r--r--apps/dav/lib/CalDAV/Schedule/IMipService.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/apps/dav/lib/CalDAV/Schedule/IMipService.php b/apps/dav/lib/CalDAV/Schedule/IMipService.php
index f7054eb2d34..54c0bc31849 100644
--- a/apps/dav/lib/CalDAV/Schedule/IMipService.php
+++ b/apps/dav/lib/CalDAV/Schedule/IMipService.php
@@ -1110,7 +1110,7 @@ class IMipService {
$sequence = $iTipMessage->sequence;
$recurrenceId = isset($vevent->{'RECURRENCE-ID'})
? $vevent->{'RECURRENCE-ID'}->serialize() : null;
- $uid = $vevent->{'UID'};
+ $uid = $vevent->{'UID'}?->getValue();
$query = $this->db->getQueryBuilder();
$query->insert('calendar_invitations')