fix random expression

src/webui/search.php

@@ -118,7 +118,9 @@ switch (true)
   // Empty query
   case empty($q):
 
-    $query = $index->search('')->sort('RAND()');
+    $query = $index->search('')
+                   ->expression('random', 'rand()')
+                   ->sort('random', 'asc');
 
   break;