diff --git a/src/components/PreparationOverview.jsx b/src/components/PreparationOverview.jsx
index 16e6d58..9547cfa 100644
--- a/src/components/PreparationOverview.jsx
+++ b/src/components/PreparationOverview.jsx
@@ -14,7 +14,10 @@ function Overview({tenders,now}) {
  useEffect(()=>{
   let cancelled=false;
   setVault({loading:true,error:null,documents:[]});
-  listDocuments().then(data=>{if(!cancelled)setVault({loading:false,error:null,documents:Array.isArray(data?.belgeler) ? data.belgeler : []});})
+  listDocuments().then(data=>{
+    if (!Array.isArray(data?.belgeler)) throw new Error('Belge listesi biçimi doğrulanamadı.');
+    if(!cancelled)setVault({loading:false,error:null,documents:data.belgeler});
+  })
    .catch(error=>{if(!cancelled)setVault({loading:false,error:error.message,documents:[]});});
   return()=>{cancelled=true;};
  },[refresh]);