diff --git a/apps/dav/lib/DAV/CustomPropertiesBackend.php b/apps/dav/lib/DAV/CustomPropertiesBackend.php
index 4dd8a91a51b3d..98fa9f9cd134a 100644
--- a/apps/dav/lib/DAV/CustomPropertiesBackend.php
+++ b/apps/dav/lib/DAV/CustomPropertiesBackend.php
@@ -9,6 +9,7 @@
 
 use Exception;
 use OCA\DAV\CalDAV\Calendar;
+use OCA\DAV\CalDAV\CalendarObject;
 use OCA\DAV\CalDAV\DefaultCalendarValidator;
 use OCA\DAV\Connector\Sabre\Directory;
 use OCA\DAV\Connector\Sabre\FilesPlugin;
@@ -223,6 +224,11 @@ public function propFind($path, PropFind $propFind) {
 			$this->cacheDirectory($path, $node);
 		}
 
+		if ($node instanceof CalendarObject) {
+			// No custom properties supported on individual events
+			return;
+		}
+
 		// First fetch the published properties (set by another user), then get the ones set by
 		// the current user. If both are set then the latter as priority.
 		foreach ($this->getPublishedProperties($path, $requestedProps) as $propName => $propValue) {