diff --git a/src/pages/admin/AdminDatabaseHealthPage.tsx b/src/pages/admin/AdminDatabaseHealthPage.tsx
index 34cdc21..ef98bb2 100644
--- a/src/pages/admin/AdminDatabaseHealthPage.tsx
+++ b/src/pages/admin/AdminDatabaseHealthPage.tsx
@@ -1002,7 +1002,9 @@ const MigrationTab: React.FC = () => {
   }, []);
 
   const _startImport = async () => {
-    if (!importTokenRef.current || !validation?.valid) return;
+    if (!importTokenRef.current || !validation?.valid || importing) return;
+
+    setImporting(true);
 
     const modeLabel = importMode === 'replace'
       ? t('Neu (Datenbank leeren und importieren)')
@@ -1012,9 +1014,7 @@ const MigrationTab: React.FC = () => {
       t('Import mit Modus "{mode}" starten? Dieser Vorgang kann nicht rueckgaengig gemacht werden.', { mode: modeLabel }),
       { title: t('Import starten'), variant: importMode === 'replace' ? 'danger' : 'primary' },
     );
-    if (!ok) return;
-
-    setImporting(true);
+    if (!ok) { setImporting(false); return; }
     setImportLog([]);
 
     const token = importTokenRef.current;