diff --git a/library/ajax/index_data.php b/library/ajax/index_data.php
index 2395718a8..982f1f4d5 100644
--- a/library/ajax/index_data.php
+++ b/library/ajax/index_data.php
@@ -132,6 +132,9 @@ switch ($mode) {
 			<td>' . $user_ratio . '</td>
 		';
         break;
+
+    default:
+        $this->ajax_die('Invalid mode');
 }
 
 $this->response['html'] = $html;
diff --git a/library/ajax/manage_admin.php b/library/ajax/manage_admin.php
index 4f174a5d7..df99dbfa7 100644
--- a/library/ajax/manage_admin.php
+++ b/library/ajax/manage_admin.php
@@ -110,6 +110,9 @@ switch ($mode) {
         $this->response['unlock_cron_html'] = '<span class="seed bold">' . $lang['ADMIN_UNLOCKED'] . '</span>';
 
         break;
+
+    default:
+        $this->ajax_die('Invalid mode');
 }
 
 $this->response['mode'] = $mode;
diff --git a/library/ajax/manage_user.php b/library/ajax/manage_user.php
index 63741ae28..8ca5890d4 100644
--- a/library/ajax/manage_user.php
+++ b/library/ajax/manage_user.php
@@ -104,6 +104,9 @@ switch ($mode) {
         $this->response['info'] = $lang['USER_ACTIVATE_OFF'];
 
         break;
+
+    default:
+        $this->ajax_die('Invalid mode');
 }
 
 $this->response['mode'] = $mode;
diff --git a/library/ajax/mod_action.php b/library/ajax/mod_action.php
index 371b8c779..9648e5a67 100644
--- a/library/ajax/mod_action.php
+++ b/library/ajax/mod_action.php
@@ -133,4 +133,7 @@ switch ($mode) {
 			</table><br />
 		';
         break;
+
+    default:
+        $this->ajax_die('Invalid mode');
 }
diff --git a/library/ajax/user_register.php b/library/ajax/user_register.php
index 6a7518ee0..2638943c7 100644
--- a/library/ajax/user_register.php
+++ b/library/ajax/user_register.php
@@ -44,6 +44,9 @@ switch ($mode) {
             $html = '<img src="./styles/images/good.gif"> <span class="seedmed bold">' . $text . '</span>';
         }
         break;
+
+    default:
+        $this->ajax_die('Invalid mode');
 }
 
 $this->response['html'] = $html;
diff --git a/src/Legacy/Caches.php b/src/Legacy/Caches.php
index 461b3715b..993952bf3 100644
--- a/src/Legacy/Caches.php
+++ b/src/Legacy/Caches.php
@@ -71,7 +71,8 @@ class Caches
                         $this->ref[$cache_name] =& $this->obj[$cache_name];
                         break;
 
-                    default: //filecache
+                    case 'filecache':
+                    default:
                         if (!isset($this->obj[$cache_name])) {
                             $this->obj[$cache_name] = new Cache\File($this->cfg['db_dir'] . $cache_name . '/', $this->cfg['prefix']);
                         }