Custom layout crashes NAV after upgrade

Currently I’m upgrading a customer from NAV2015 to NAV2017.
During the implementation of NAV2015 the customer has asked me, I they could design there reports themselfs.

And my reflection was, why not.

So as said the customer changed there report layout within NAV with the feature “Custom Layouts”.
A new feature back in NAV2015 but still available in NAV2017.

Now during the upgrade of this customer I ran into some issues when testing the upgraded version.
Every time I try to print a report with a custom layout NAV crashes with no more information.

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Report Error “The definition of the report ‘ ‘ is invalid”

Designing reports in NAV is a time consuming task. Microsoft has made several changes since the introduction of RDLC. But still partners must budget enough time to create custom layouts.

In NAV2015 Microsoft introduced the possibility to create custom designs from the Windows client instead of the development environment.

This feature lets end users design their own layouts. So that partners can reduce budget. I think end users love this feature but now partners can have helpdesk questions with the following error.

Ok, this error doesn’t say much for the end user and they have no clue how to fix.
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