diff --git a/src/api/routes/deliveryParse.js b/src/api/routes/deliveryParse.js
index 1ca9d4d..080aee6 100644
--- a/src/api/routes/deliveryParse.js
+++ b/src/api/routes/deliveryParse.js
@@ -31,7 +31,7 @@ function isPdfUpload(file) {
 
 // ─── SSE helpers ────────────────────────────────────────────────────────────────
 function sseWrite(res, event, data) {
-    if (res.writableEnded) return;
+    if (res.writableEnded || res.destroyed) return;
     res.write(`event: ${event}\ndata: ${JSON.stringify(data)}\n\n`);
 }
 
@@ -276,8 +276,21 @@ async function parseDocumentManifest({ req, res, pages, sourceLabel }) {
             }),
     });
 
+    const onDisconnect = () => {
+        if (!res.writableEnded) {
+            orbiter.abort();
+        }
+    };
+    req.on('close', onDisconnect);
+    res.on('close', onDisconnect);
+
     // ── Process all pages in one batch ───────────────────────────────
     try {
+        if (res.destroyed || req.destroyed) {
+            orbiter.abort();
+            return;
+        }
+
         const pageContent = pages
             .map((p, idx) => `--- Page ${idx + 1} of ${pages.length} ---\n${p}`)
             .join('\n\n');
@@ -301,9 +314,16 @@ ${pageContent}`;
         currentPage = 1;
         await orbiter.run({ prompt, model, tools: [outputManifestTool] });
     } catch (err) {
-        if (!res.writableEnded) {
+        if (!res.writableEnded && !res.destroyed) {
             sseWrite(res, 'error', { message: 'LLM processing failed: ' + err.message });
         }
+    } finally {
+        req.off('close', onDisconnect);
+        res.off('close', onDisconnect);
+    }
+
+    if (res.writableEnded || res.destroyed) {
+        return;
     }
 
     // ── Final result ─────────────────────────────────────────────────