diff --git a/src/agent/runner.rs b/src/agent/runner.rs
index edc323f..bd4eab6 100644
--- a/src/agent/runner.rs
+++ b/src/agent/runner.rs
@@ -351,11 +351,13 @@ impl Agent {
                     tokio::time::sleep(std::time::Duration::from_secs(2)).await;
                     continue;
                 }
+                let _ = ui_tx.send(UiMessage::Activity(String::new()));
                 return Err(err);
             }
 
             if finish_reason.as_deref() == Some("error") {
                 let detail = if content.is_empty() { "no details".into() } else { content };
+                let _ = ui_tx.send(UiMessage::Activity(String::new()));
                 return Err(anyhow::anyhow!("model stream error: {}", detail));
             }