From 7d82ef1acfa2cf6a9018b0be328e57c62931e54b Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Fri, 17 Apr 2026 13:06:02 +0200
Subject: [PATCH] Handle client-side errors in message sending and update UI
 accordingly

---
 src/App.jsx | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/App.jsx b/src/App.jsx
index 45f2d51..a94da06 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -2573,6 +2573,23 @@ async function sendMessage() {
         }
 
         console.error('Failed to send message:', error)
+        if (Number(error?.status) >= 400 && Number(error?.status) < 500) {
+          setAssistantMessageContent(targetSessionId, assistantMsgId, fullReply, { removeIfEmpty: true })
+          setChatSessions(prevSessions =>
+            prevSessions.map(session =>
+              session.session_id === targetSessionId
+                ? {
+                    ...session,
+                    messages: (session.messages || []).filter(message => message.id !== userMsg.id),
+                  }
+                : session
+            )
+          )
+          setInput(composerSnapshot)
+          setComposerAttachments(attachmentSnapshot)
+          window.alert(getErrorText(error))
+          return
+        }
         setAssistantMessageContent(targetSessionId, assistantMsgId, 'Error: ' + getErrorText(error), { removeIfEmpty: true })
         return
       }