Interactive Report NullReferenceException

Hello together
I created a master-detail report where I'm using hyperlinks in the master-report to create links to the detailed pages. This all works just fine.
My problem is, when I click a link to open the detailed page, then close that one again and then ask to print the master report, I get a NullReferenceException.
Could that be because I use the same datasource in the master and the detailed report (where I filter the results according to the clicked link)?

Thanks for your help.

Regards
Felix

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