When I create a project I get an error page, and when I hit save again, the project is added twice

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When I add project and click [& stay on this page], i get an error page.
The project gets added, but if I click the [edit project] icon, I see the error page
When I click the [& stay on this page] again, the project is added 2x.
I don’t have issues if I select [&got back to overview]