diff --git a/src/admin/pages/InvoiceDetail.tsx b/src/admin/pages/InvoiceDetail.tsx
index ff62eb6..e0779d7 100644
--- a/src/admin/pages/InvoiceDetail.tsx
+++ b/src/admin/pages/InvoiceDetail.tsx
@@ -975,18 +975,21 @@ export default function InvoiceDetail() {
 
   // ─── Edit mode: PDF export ───
   const handleViewPdf = async (_lang = "cs") => {
+    const newWindow = window.open("", "_blank");
     setPdfLoading(true);
     try {
       const response = await apiFetch(`${API_BASE}/invoices/${id}/file`);
       if (!response.ok) {
+        newWindow?.close();
         alert.error("PDF soubor nenalezen — uložte fakturu pro vygenerování");
         return;
       }
       const blob = await response.blob();
       const url = URL.createObjectURL(blob);
-      window.open(url, "_blank");
+      if (newWindow) newWindow.location.href = url;
       setTimeout(() => URL.revokeObjectURL(url), 60000);
     } catch {
+      newWindow?.close();
       alert.error("Chyba připojení");
     } finally {
       setPdfLoading(false);
diff --git a/src/admin/pages/OfferDetail.tsx b/src/admin/pages/OfferDetail.tsx
index a48eb6a..a0163d4 100644
--- a/src/admin/pages/OfferDetail.tsx
+++ b/src/admin/pages/OfferDetail.tsx
@@ -768,19 +768,25 @@ export default function OfferDetail() {
 
   const handlePdf = async () => {
     if (!isEdit || pdfLoading) return;
+    const newWindow = window.open("", "_blank");
     setPdfLoading(true);
     try {
       const response = await apiFetch(`${API_BASE}/offers/${id}/file`);
-      if (response.status === 401) return;
+      if (response.status === 401) {
+        newWindow?.close();
+        return;
+      }
       if (!response.ok) {
+        newWindow?.close();
         alert.error("PDF soubor nenalezen — uložte nabídku pro vygenerování");
         return;
       }
       const blob = await response.blob();
       const url = URL.createObjectURL(blob);
-      window.open(url, "_blank");
+      if (newWindow) newWindow.location.href = url;
       setTimeout(() => URL.revokeObjectURL(url), 60000);
     } catch {
+      newWindow?.close();
       alert.error("Chyba při generování PDF");
     } finally {
       setPdfLoading(false);
diff --git a/src/admin/pages/Offers.tsx b/src/admin/pages/Offers.tsx
index 119be91..3624320 100644
--- a/src/admin/pages/Offers.tsx
+++ b/src/admin/pages/Offers.tsx
@@ -221,21 +221,27 @@ export default function Offers() {
 
   const handlePdf = async (quotation: Quotation) => {
     if (pdfLoading) return;
+    const newWindow = window.open("", "_blank");
     setPdfLoading(quotation.id);
     try {
       const response = await apiFetch(
         `${API_BASE}/offers/${quotation.id}/file`,
       );
-      if (response.status === 401) return;
+      if (response.status === 401) {
+        newWindow?.close();
+        return;
+      }
       if (!response.ok) {
+        newWindow?.close();
         alert.error("PDF soubor nenalezen — otevřete nabídku a uložte ji");
         return;
       }
       const blob = await response.blob();
       const url = URL.createObjectURL(blob);
-      window.open(url, "_blank");
+      if (newWindow) newWindow.location.href = url;
       setTimeout(() => URL.revokeObjectURL(url), 60000);
     } catch {
+      newWindow?.close();
       alert.error("Chyba připojení");
     } finally {
       setPdfLoading(null);
diff --git a/src/admin/pages/ReceivedInvoices.tsx b/src/admin/pages/ReceivedInvoices.tsx
index c22f3fb..c165a3c 100644
--- a/src/admin/pages/ReceivedInvoices.tsx
+++ b/src/admin/pages/ReceivedInvoices.tsx
@@ -503,19 +503,22 @@ export default function ReceivedInvoices({
   };
 
   const openFile = async (inv: ReceivedInvoice) => {
+    const newWindow = window.open("", "_blank");
     try {
       const response = await apiFetch(
         `${API_BASE}/received-invoices/${inv.id}/file`,
       );
       if (!response.ok) {
+        newWindow?.close();
         alert.error("Nepodařilo se načíst soubor");
         return;
       }
       const blob = await response.blob();
       const url = URL.createObjectURL(blob);
-      window.open(url, "_blank");
+      if (newWindow) newWindow.location.href = url;
       setTimeout(() => URL.revokeObjectURL(url), 60000);
     } catch {
+      newWindow?.close();
       alert.error("Chyba připojení");
     }
   };