diff --git a/app/invoices/[id]/page.tsx b/app/invoices/[id]/page.tsx
index 38d7bf6..ce7839d 100644
--- a/app/invoices/[id]/page.tsx
+++ b/app/invoices/[id]/page.tsx
@@ -15,7 +15,6 @@ export default async function InvoiceDetail({ params }: { params: { id: string }
       filter: `invoice="${params.id}"`,
       sort: "line_no",
     });
-    lines = lr.items;
   } catch (e: any) {
     return (
       <div className="space-y-4">
diff --git a/app/invoices/page.tsx b/app/invoices/page.tsx
index f732a1f..997e726 100644
--- a/app/invoices/page.tsx
+++ b/app/invoices/page.tsx
@@ -25,22 +25,28 @@ export default async function InvoicesPage({
   }
   filter = parts.join(" && ");
 
-  const filterParam = filter ? `&filter=${encodeURIComponent(filter)}` : "";
   let records: any[] = [];
   try {
-    const r = await pb.collection("JEI_invoices").getList(1, 200, {
-      sort: "-invoice_date",
-      filter: filter || undefined,
-    });
+    // Don't pass filter when empty — the SDK serializes `undefined` as the
+    // literal string "undefined" which PB rejects with 400.
+    const opts: any = { sort: "-invoice_date", perPage: 200 };
+    if (filter) opts.filter = filter;
+    const r = await pb.collection("JEI_invoices").getList(1, 200, opts);
     records = r.items;
   } catch (e: any) {
+    // Debug: log full error to server console
+    console.error("[/invoices] PB error:", e?.status, e?.message, JSON.stringify(e?.data || {}));
+    const msg = String(e?.message || e);
+    const status = e?.status ? `[${e.status}] ` : "";
     return (
       <div className="space-y-4">
         <h1 className="text-2xl font-bold text-brand-dark">Invoices</h1>
         <div className="bg-red-50 border border-red-200 text-red-800 rounded p-4">
-          <div className="font-semibold">Cannot reach PocketBase</div>
-          <div className="text-sm mt-1">{String(e?.message || e)}</div>
-          <div className="text-xs mt-2">Check PB_TOKEN in .env.local — it expires every ~24h.</div>
+          <div className="font-semibold">Cannot reach PocketBase {status}</div>
+          <div className="text-sm mt-1">{msg}</div>
+          {e?.data && (
+            <pre className="text-xs mt-2 bg-red-100 p-2 rounded overflow-auto">{JSON.stringify(e.data, null, 2)}</pre>
+          )}
         </div>
       </div>
     );
diff --git a/app/stock-codes/[code]/page.tsx b/app/stock-codes/[code]/page.tsx
index 9e0bed5..621366b 100644
--- a/app/stock-codes/[code]/page.tsx
+++ b/app/stock-codes/[code]/page.tsx
@@ -22,6 +22,13 @@ export default async function StockCodeDetail({ params }: { params: { code: stri
       filter: `stock_code="${sc.id}"`,
       expand: "invoice",
     });
+    sc = found.items[0];
+    if (!sc) return notFound();
+    // All lines for this stock code, with their invoice (expand)
+    const lr = await pb.collection("JEI_invoice_lines").getList(1, 500, {
+      filter: `stock_code="${sc.id}"`,
+      expand: "invoice",
+    });
     lines = lr.items;
   } catch (e: any) {
     return (
diff --git a/app/stock-codes/page.tsx b/app/stock-codes/page.tsx
index 0eb9de0..d105be5 100644
--- a/app/stock-codes/page.tsx
+++ b/app/stock-codes/page.tsx
@@ -14,10 +14,10 @@ export default async function StockCodesPage({
   // Fetch all stock codes
   let codes: any[] = [];
   try {
-    const r = await pb.collection("JEI_stock_codes").getList(1, 500, {
-      sort: "code",
-      filter: q ? `code~"${q.replace(/"/g, '\\"')}" || description_goods~"${q.replace(/"/g, '\\"')}"` : undefined,
-    });
+    // Don't pass filter when empty — SDK serializes `undefined` as literal "undefined"
+    const opts: any = { sort: "code", perPage: 500 };
+    if (q) opts.filter = `code~"${q.replace(/"/g, '\\"')}" || description_goods~"${q.replace(/"/g, '\\"')}"`;
+    const r = await pb.collection("JEI_stock_codes").getList(1, 500, opts);
     codes = r.items;
   } catch (e: any) {
     return (
diff --git a/scripts/debug_invoices.mjs b/scripts/debug_invoices.mjs
new file mode 100644
index 0000000..08cda35
--- /dev/null
+++ b/scripts/debug_invoices.mjs
@@ -0,0 +1,24 @@
+// Debug: try to fetch invoices exactly like /invoices page does
+import { default as PocketBase } from 'pocketbase';
+import fs from 'fs';
+const envFile = fs.readFileSync('.env.local', 'utf8');
+const token = envFile.match(/PB_TOKEN=(.+)/)[1].trim();
+const url = envFile.match(/PB_URL=(.+)/)[1].trim();
+process.env.PB_TOKEN = token;
+process.env.NEXT_PUBLIC_PB_URL = url;
+
+const pb = new PocketBase(url);
+pb.authStore.save(token);
+
+(async () => {
+  try {
+    const r = await pb.collection('JEI_invoices').getList(1, 200, {
+      sort: '-invoice_date',
+    });
+    console.log('OK items=' + r.items.length + ' total=' + r.totalItems);
+  } catch (e) {
+    console.log('ERR ' + e.status + ': ' + e.message);
+    console.log('data: ' + JSON.stringify(e.data));
+    console.log('url: ' + e.url);
+  }
+})();