diff --git a/NetBiblio.php b/NetBiblio.php
index 2b74541..2c2293b 100644
--- a/NetBiblio.php
+++ b/NetBiblio.php
@@ -317,7 +317,7 @@ class NetBiblio extends WebService
 
             // add fields for mobile apps compatibility
             $b['date'] = date('Y.m.d', strtotime($b['availabilityDate']));
-            $b['readBy'] = $b['reader'];
+            $b['readBy'] = isset($b['reader']) ? $b['reader'] : null;
             $b['code3'] = $b['producerCode'];
             $b['code3Long'] = $b['producer'];
             $b['typeMedia1'] = $b['mediaType'];
@@ -394,7 +394,8 @@ class NetBiblio extends WebService
 
         $bs = new BookSearch();
         $bs->addSortField('random_'.$seed);
-        return $this->AddBookData($bs->getResults(0, $number));
+        $results = $bs->getResults(0, $number);
+        return $this->AddBookData($results['books']);
     }
 
     public function Search($query, $start, $limit)
@@ -525,19 +526,12 @@ class NetBiblio extends WebService
         }
         $s->addSortField('availabilityDate');
 
-        try {
-            $results = $s->getResults(0, $itemsByGroup);
-        } catch(\SolrClientException $e) {
-            throw new WebException ("SolrError", $e->getMessage(), -710);
-        }
-
-        $ids = array_map(function($r) { return $r['id']; }, $results['response']['docs']);
-        $books = AudioBook::findBy('NoticeID', $ids, true);
-        $books = $this->AddBookData($books);
+        $results = $s->getResults(0, $itemsByGroup);
+        $books = $this->AddBookData($results['books']);
 
         $data = array();
         foreach($books as $b) {
-            $data[$b['type']][] = $b;
+            $data[$b['genre']][] = $b;
         }
         return $data;
     }