From 71151640b2cbc464831f10d57f4ba88c52161cf3 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 21 May 2026 14:00:43 +0100
Subject: [PATCH] Update error for auth_event_ids

---
 rust/src/events/formats/vmsc4242.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/rust/src/events/formats/vmsc4242.rs b/rust/src/events/formats/vmsc4242.rs
index 2fbe62000d..aab4d486f9 100644
--- a/rust/src/events/formats/vmsc4242.rs
+++ b/rust/src/events/formats/vmsc4242.rs
@@ -71,9 +71,10 @@ impl EventFormatVMSC4242 {
         if event.fields.common_fields.type_state_key_tuple() != Some((M_ROOM_CREATE, ""))
             && auth_event_ids.is_empty()
         {
-            return Err(PyRuntimeError::new_err(
-                "auth_event_ids is unexpectedly empty for a non-create event",
-            ));
+            return Err(PyRuntimeError::new_err(format!(
+                "auth_event_ids has not been calculated: {}",
+                event.event_id
+            )));
         }
 
         Ok(auth_event_ids)