navigation->goto_page( 'page1.htm' ) and and html anchors

Hello,

we often use the command "navigation->goto_page", e.g. from handler OnInputProcessing in a BSP.

Now i have the must to give an html anchor with to the page, i tried it like this:

navigation->goto_page( 'page1.htm#anchor1' ).

But the i get the following error:

Access not possible using 'NULL' object reference

Thank you for any idea, how to handle this problem.

Regards

Marcus