diff --git a/plugins/housekeeper/DiskUsageDashlet.inc.php b/plugins/housekeeper/DiskUsageDashlet.inc.php
index cd89f18..5d84e51 100644
--- a/plugins/housekeeper/DiskUsageDashlet.inc.php
+++ b/plugins/housekeeper/DiskUsageDashlet.inc.php
@@ -47,8 +47,9 @@ class DiskUsageDashlet extends KTBaseDashlet
 
     function is_active($oUser)
     {
-        $usage = unserialize(KTUtil::getSystemSetting('DiskUsage','n/a'));
-        if ($usage == 'n/a') return false;
+        $usage = KTUtil::getSystemSetting('DiskUsage');
+        if (empty($usage)) return false;
+        $usage = unserialize($usage);
         $this->usage = $usage;
         return Permission::userIsSystemAdministrator();
     }
diff --git a/plugins/housekeeper/FolderUsageDashlet.inc.php b/plugins/housekeeper/FolderUsageDashlet.inc.php
index 020f6d7..7b28106 100644
--- a/plugins/housekeeper/FolderUsageDashlet.inc.php
+++ b/plugins/housekeeper/FolderUsageDashlet.inc.php
@@ -47,6 +47,11 @@ class FolderUsageDashlet extends KTBaseDashlet
 
     function is_active($oUser)
     {
+        $usage = KTUtil::getSystemSetting('KTUsage');
+        if (empty($usage)) return false;
+
+        $this->usage = unserialize($usage);
+
         return Permission::userIsSystemAdministrator();
     }
 
@@ -69,11 +74,11 @@ class FolderUsageDashlet extends KTBaseDashlet
             $dispatcherURL = '/'.$dispatcherURL;
         }
 
-        $usage = unserialize(KTUtil::getSystemSetting('KTUsage','n/a'));
+
 
         $aTemplateData = array(
         'context' => $this,
-        'usages'=>$usage,
+        'usages'=>$this->usage,
         'dispatcherURL'=>$dispatcherURL
         );