From c9866f89a3defcd9b8c1d4d1c016bda542884852 Mon Sep 17 00:00:00 2001
From: Joas Schilling <coding@schilljs.com>
Date: Fri, 18 Jul 2025 11:09:04 +0200
Subject: [PATCH] fix(chat): Fix guests in a fully empty chat

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

[skip ci]
---
 lib/Service/RoomFormatter.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/Service/RoomFormatter.php b/lib/Service/RoomFormatter.php
index 346016050..4d9c1205b 100644
--- a/lib/Service/RoomFormatter.php
+++ b/lib/Service/RoomFormatter.php
@@ -403,6 +403,11 @@ class RoomFormatter {
 			}
 		}
 
+		if ($roomData['lastReadMessage'] === 0) {
+			// Guest in a fully expired chat, no history, just loading the chat from beginning for now
+			$roomData['lastReadMessage'] = ChatManager::UNREAD_FIRST_MESSAGE;
+		}
+
 		if ($currentUser instanceof IUser
 			&& $attendee->getActorType() === Attendee::ACTOR_USERS
 			&& $roomData['lastReadMessage'] === ChatManager::UNREAD_FIRST_MESSAGE