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-rw-r--r--apps/dav/lib/CalDAV/BirthdayService.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/apps/dav/lib/CalDAV/BirthdayService.php b/apps/dav/lib/CalDAV/BirthdayService.php
index 5d1d55879ca..93344e33186 100644
--- a/apps/dav/lib/CalDAV/BirthdayService.php
+++ b/apps/dav/lib/CalDAV/BirthdayService.php
@@ -470,7 +470,7 @@ class BirthdayService {
*/
private function formatTitle(string $field,
string $name,
- int $year = null,
+ ?int $year = null,
bool $supports4Byte = true):string {
if ($supports4Byte) {
switch ($field) {