Fix potential guest support

Signed-off-by: Joas Schilling <coding@schilljs.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/Collaboration/Collaborators/Listener.php b/lib/Collaboration/Collaborators/Listener.php
index fdca86a18..d39101d5d 100644
--- a/lib/Collaboration/Collaborators/Listener.php
+++ b/lib/Collaboration/Collaborators/Listener.php
@@ -132,7 +132,11 @@ class Listener {
 		$sessionId = $this->talkSession->getSessionForRoom($token);
 		try {
 			$this->room = $this->manager->getRoomForUserByToken($token, $this->userId);
-			$this->participantService->getParticipant($this->room, $this->userId, $sessionId);
+			if ($this->userId !== null) {
+				$this->participantService->getParticipant($this->room, $this->userId, $sessionId);
+			} else {
+				$this->participantService->getParticipantBySession($this->room, $sessionId);
+			}
 		} catch (RoomNotFoundException $e) {
 			return $results;
 		} catch (ParticipantNotFoundException $e) {