diff --git a/module/file/model.php b/module/file/model.php
index 592754f8e4..119027d996 100644
--- a/module/file/model.php
+++ b/module/file/model.php
@@ -115,6 +115,7 @@ class fileModel extends model
 
         $this->app->loadClass('purifier', true);
         $config   = HTMLPurifier_Config::createDefault();
+        $config->set('Cache.DefinitionImpl', null);
         $purifier = new HTMLPurifier($config);
 
         /* If the file var name is an array. */
diff --git a/module/productplan/model.php b/module/productplan/model.php
index 14834e9b49..adb95b16d9 100644
--- a/module/productplan/model.php
+++ b/module/productplan/model.php
@@ -164,6 +164,7 @@ class productplanModel extends model
 
         $this->app->loadClass('purifier', true);
         $config   = HTMLPurifier_Config::createDefault();
+        $config->set('Cache.DefinitionImpl', null);
         $purifier = new HTMLPurifier($config);
 
         $plans = array();