From 9bb33c4d24a291f1f8a77b55069bc28089d0cd3d Mon Sep 17 00:00:00 2001
From: Kegan Dougal <kegan@matrix.org>
Date: Wed, 12 Feb 2020 12:11:33 +0000
Subject: [PATCH] Allow empty last sent ID for the first event

---
 federationsender/storage/postgres/storage.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/federationsender/storage/postgres/storage.go b/federationsender/storage/postgres/storage.go
index c60f6dc5c..d97b5d296 100644
--- a/federationsender/storage/postgres/storage.go
+++ b/federationsender/storage/postgres/storage.go
@@ -87,7 +87,7 @@ func (d *Database) UpdateRoom(
 			return nil
 		}
 
-		if lastSentEventID != oldEventID {
+		if lastSentEventID != "" && lastSentEventID != oldEventID {
 			return types.EventIDMismatchError{
 				DatabaseID: lastSentEventID, RoomServerID: oldEventID,
 			}