From 67175e23316b65b54af2465fa0129c347edb9a6d Mon Sep 17 00:00:00 2001
From: Kegan Dougal <kegan@matrix.org>
Date: Tue, 20 Oct 2020 10:39:11 +0100
Subject: [PATCH] Only complain about invalid state deltas for non-overwrite
 events

---
 roomserver/internal/input/input_latest_events.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/roomserver/internal/input/input_latest_events.go b/roomserver/internal/input/input_latest_events.go
index 5adcd0877..f76b0a0b4 100644
--- a/roomserver/internal/input/input_latest_events.go
+++ b/roomserver/internal/input/input_latest_events.go
@@ -233,7 +233,7 @@ func (u *latestEventsUpdater) latestState() error {
 	if err != nil {
 		return fmt.Errorf("roomState.DifferenceBetweenStateSnapshots: %w", err)
 	}
-	if len(u.removed) > len(u.added) {
+	if !u.stateAtEvent.Overwrite && len(u.removed) > len(u.added) {
 		// This really shouldn't happen.
 		// TODO: What is ultimately the best way to handle this situation?
 		logrus.Errorf(