update

reader/src/App.jsx

@@ -230,19 +230,19 @@ export function Reader({ topic }) {
 
   const selectedResource = topic.resources[resourceIdx];
 
-  if (resourceIdx === -1) {
-    return <div className="text-sm font-medium p-4">No data</div>;
-  }
-
   return (
     <>
       <div className="flex-1">
-        <PDFViewer
-          file={topic.resources[resourceIdx]}
-          compact={config.narrowMode}
-          justifyText={config.justifyText}
-          zoomFactor={config.contentZoomFactor}
-        />
+        {resourceIdx === -1 ? (
+          <div className="text-sm font-medium p-4">No data</div>
+        ) : (
+          <PDFViewer
+            file={topic.resources[resourceIdx]}
+            compact={config.narrowMode}
+            justifyText={config.justifyText}
+            zoomFactor={config.contentZoomFactor}
+          />
+        )}
         <div className="absolute bottom-10 flex justify-between px-4 py-2 w-full z-999">
           <div className="flex w-full space-x-2">
             <Link to="/" className="cursor-pointer p-2 rounded-full bg-blue-600 text-white mr-auto">