diff --git a/scripts/src/hwlab-node-web-observe-runner-source.ts b/scripts/src/hwlab-node-web-observe-runner-source.ts
index 7b00d626..d2ea11b0 100644
--- a/scripts/src/hwlab-node-web-observe-runner-source.ts
+++ b/scripts/src/hwlab-node-web-observe-runner-source.ts
@@ -363,7 +363,12 @@ async function sendPrompt(text) {
   await submit.waitFor({ state: "visible", timeout: 15000 });
   const chatResponsePromise = page.waitForResponse((response) => {
     const request = response.request();
-    return request.method().toUpperCase() === "POST" && response.url().includes("/v1/agent/chat");
+    if (request.method().toUpperCase() !== "POST") return false;
+    try {
+      return new URL(response.url()).pathname === "/v1/agent/chat";
+    } catch {
+      return false;
+    }
   }, { timeout: 20000 }).catch((error) => ({ waitError: errorSummary(error) }));
   await submit.click();
   const chatResponse = await chatResponsePromise;