From b997d00947e7a1cb72bcf53cdf8623e0082b7966 Mon Sep 17 00:00:00 2001
From: G30 <50341825+silentoplayz@users.noreply.github.com>
Date: Tue, 30 Dec 2025 11:05:55 -0500
Subject: [PATCH] fix: prevent crash when regenerating message with missing
 parent (#20264)

---
 src/lib/components/chat/Chat.svelte | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/lib/components/chat/Chat.svelte b/src/lib/components/chat/Chat.svelte
index c5221d6f6..a423b1694 100644
--- a/src/lib/components/chat/Chat.svelte
+++ b/src/lib/components/chat/Chat.svelte
@@ -2141,6 +2141,11 @@
 		if (history.currentId) {
 			let userMessage = history.messages[message.parentId];
 
+			if (!userMessage) {
+				toast.error($i18n.t('Parent message not found'));
+				return;
+			}
+
 			if (autoScroll) {
 				scrollToBottom();
 			}