diff --git a/paperless-frontend/src/pages/MailDetailPage.tsx b/paperless-frontend/src/pages/MailDetailPage.tsx
index c06cd5a..a94d792 100644
--- a/paperless-frontend/src/pages/MailDetailPage.tsx
+++ b/paperless-frontend/src/pages/MailDetailPage.tsx
@@ -102,18 +102,18 @@ export default function MailDetailPage() {
       key: 'PaperlessDocumentIds',
       width: 130,
       render: (ids: Record<string, number> | null) => {
-        if (!ids) return null;
-        const entries = Object.entries(ids);
+        if (!ids || typeof ids !== 'object') return null;
+        const entries = Object.entries(ids).filter(([, v]) => v != null);
         if (entries.length === 0) return null;
         
+        const paperlessUrl = getEnv('PAPERLESS_URL');
         return (
           <Space size={[0, 4]} wrap>
-            {entries.map(([, id]) => {
-              const paperlessUrl = getEnv('PAPERLESS_URL');
-              return (
+            {entries.map(([rangeKey, id]) =>
+              paperlessUrl ? (
                 <a
-                  key={id}
-                  href={paperlessUrl ? `${paperlessUrl}/documents/${id}` : undefined}
+                  key={rangeKey}
+                  href={`${paperlessUrl}/documents/${id}`}
                   target="_blank"
                   rel="noopener noreferrer"
                   onClick={(e) => e.stopPropagation()}
@@ -123,8 +123,10 @@ export default function MailDetailPage() {
                     {id}
                   </Tag>
                 </a>
-              );
-            })}
+              ) : (
+                <Tag color="blue" key={rangeKey}>{id}</Tag>
+              )
+            )}
           </Space>
         );
       }
@@ -151,13 +153,14 @@ export default function MailDetailPage() {
             cancelText="Nein"
             placement="bottomRight"
           >
-            <Button danger icon={<CloseCircleOutlined />}>
+            <Button danger icon={<CloseCircleOutlined />} disabled={email.Status === 1}>
               Als ignoriert markieren
             </Button>
           </Popconfirm>
-          <Button 
-            type="primary" 
-            icon={<FileTextOutlined />} 
+          <Button
+            type="primary"
+            icon={<FileTextOutlined />}
+            disabled={email.Status === 1}
             onClick={async () => {
               if (!email) return;
               const hide = message.loading('Prüfe Vorschaubilder...', 0);