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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