diff --git a/eclipse.org-common/system/app.class.php b/eclipse.org-common/system/app.class.php
index 35243b4..e90b381 100644
--- a/eclipse.org-common/system/app.class.php
+++ b/eclipse.org-common/system/app.class.php
@@ -743,6 +743,10 @@
    * Sets the headers to prevent caching for the different browsers.
    */
   function preventCaching() {
+    // Bug 535031 - Bugzilla manager doesn't allow to view nor modify project
+    if (session_id() == '') {
+      session_start();
+    }
     header("Cache-Control: no-store, no-cache, private, must-revalidate, max-age=0, max-stale=0");
     header("Cache-Control: post-check=0, pre-check=0", FALSE);
     header("Pragma: no-cache");