diff --git a/include/session.php b/include/session.php
index b68843c..8cd0fdc 100644
--- a/include/session.php
+++ b/include/session.php
@@ -54,7 +54,8 @@ class session
     // destroy session
     function destroy ()
     {
-        session_destroy();
+        if(session_id() != "")
+            session_destroy();
     }
     
     // open session file (not needed for DB access)