From fa6708c27ec43b5171ab8cdb8aa8f03dc9f410bb Mon Sep 17 00:00:00 2001
From: Kegan Dougal <kegan@matrix.org>
Date: Mon, 1 Aug 2022 16:34:11 +0100
Subject: [PATCH] Gracefully handle missing room_ids

---
 src/sliding-sync.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sliding-sync.ts b/src/sliding-sync.ts
index 5ea7d86c4..5254a077d 100644
--- a/src/sliding-sync.ts
+++ b/src/sliding-sync.ts
@@ -605,7 +605,7 @@ export class SlidingSync extends TypedEventEmitter<SlidingSyncEvent, SlidingSync
                         listIndex,
                         op.range[0],
                         op.range[1],
-                        op.room_ids.join(" "),
+                        (op.room_ids || []).join(" "),
                         ";",
                     );
                     break;