diff --git a/include/class.plugin.php b/include/class.plugin.php
index a6b653697e1b8ac5e3d60cc7ee96d8e5e59ad43b..db496e33a026b6652836435a6705fa59963dd80d 100644
--- a/include/class.plugin.php
+++ b/include/class.plugin.php
@@ -402,7 +402,9 @@ abstract class Plugin {
         if (!db_query($sql) || !db_affected_rows())
             return false;
 
-        $this->getConfig()->purge();
+        if ($config = $this->getConfig())
+            $config->purge();
+
         return true;
     }