diff --git a/controllers/common.php b/controllers/common.php
index e622a84..ff39893 100644
--- a/controllers/common.php
+++ b/controllers/common.php
@@ -14,7 +14,7 @@ Router\before(function($action) {
     // Select the requested database either from post param database or from the
     // session variable. If it fails, logout to destroy session and
     // 'remember me' cookie
-    if (! empty(Request\value('database')) && ! Model\Database\select(Request\value('database'))) {
+    if (! is_null(Request\value('database')) && ! Model\Database\select(Request\value('database'))) {
         Model\User\logout();
         Response\redirect('?action=login');
     }