diff --git a/base.php b/base.php
index 484416a..09d312f 100644
--- a/base.php
+++ b/base.php
@@ -455,7 +455,7 @@ class Page
         $this->subtitle = $config['cops_subtitle_default'];
         if (Base::noDatabaseSelected ()) {
             $i = 0;
-            foreach (array_keys ($config['calibre_directory']) as $key) {
+            foreach (Base::getDbNameList () as $key) {
                 $nBooks = Book::getBookCount ($i);
                 array_push ($this->entryArray, new Entry ($key, "cops:{$i}:catalog",
                                         str_format (localize ("bookword", $nBooks), $nBooks), "text",
@@ -740,7 +740,7 @@ class PageQueryResult extends Page
         // Special case when we are doing a search and no database is selected
         if (Base::noDatabaseSelected ()) {
             $i = 0;
-            foreach ($config['calibre_directory'] as $key => $value) {
+            foreach (Base::getDbNameList () as $key) {
                 Base::clearDb ();
                 list ($array, $totalNumber) = Book::getBooksByQuery (array ("all" => $crit), 1, $i, 1);
                 array_push ($this->entryArray, new Entry ($key, DB . ":query:{$i}",
@@ -904,6 +904,15 @@ abstract class Base
             return array ("" => $config['calibre_directory']);
         }
     }
+    
+    public static function getDbNameList () {
+        global $config;
+        if (self::isMultipleDatabaseEnabled ()) {
+            return array_keys ($config['calibre_directory']);
+        } else {
+            return array ("");
+        }
+    }
 
     public static function getDbName ($database = NULL) {
         global $config;
@@ -949,6 +958,17 @@ abstract class Base
         }
         return self::$db;
     }
+    
+    public static function checkDatabaseAvailability () {
+        if (self::noDatabaseSelected ()) {
+            for ($i = 0; $i < count (self::getDbList ()); $i++) {
+                self::getDb ($i);
+                self::clearDb ();
+            }
+        } else {
+            self::getDb ();
+        }
+    }
 
     public static function clearDb () {
         self::$db = NULL;
diff --git a/book.php b/book.php
index 7ab3955..2eb59dd 100644
--- a/book.php
+++ b/book.php
@@ -642,7 +642,7 @@ function getJson ($complete = false) {
         // Special case when no databases were chosen, we search on all databases
         if (Base::noDatabaseSelected ()) {
             $i = 0;
-            foreach (array_keys ($config['calibre_directory']) as $key) {
+            foreach (Base::getDbNameList () as $key) {
                 Base::clearDb ();
                 array_push ($out, array ("title" => $key,
                                          "class" => "tt-header",
diff --git a/index.php b/index.php
index c162d09..2b68608 100644
--- a/index.php
+++ b/index.php
@@ -33,16 +33,7 @@
 
     // Access the database ASAP to be sure it's readable, redirect if that's not the case.
     // It has to be done before any header is sent.
-    if (Base::noDatabaseSelected ()) {
-        $i = 0;
-        foreach (array_keys ($config['calibre_directory']) as $key) {
-            $test = Base::getDb ($i);
-            Base::clearDb ();
-            $i++;
-        }
-    } else {
-        $test = Base::getDb ();
-    }
+    Base::checkDatabaseAvailability ();
 
     if ($config ['cops_fetch_protect'] == "1") {
         session_start();