diff --git a/application/portalwebpage.class.inc.php b/application/portalwebpage.class.inc.php
index 430543852..1b19d6bdb 100644
--- a/application/portalwebpage.class.inc.php
+++ b/application/portalwebpage.class.inc.php
@@ -679,6 +679,7 @@ EOF
 		$sTransactionId = utils::GetNewTransactionId();
 		$this->SetTransactionId($sTransactionId);
 		$this->add("<input type=\"hidden\" name=\"transaction_id\" value=\"$sTransactionId\">\n");
+		$oPage->add_ready_script("$(window).unload(function() { OnUnload('$sTransactionId') } );\n");
 	}
 
 	public function WizardFormButtons($iButtonFlags)