Error on "Edit Install" of an app relying on Oauth


I’m migrating an app to Oauth ( and encountered an issue while doing some tests on one of our sites.

Once the app linked to an account, when clicking on “Edit Install” and clicking on “save changes on all pages”, we can see the following error:


This error prevents the app changes to be saved.

This issue can be reproduced on apps already released on the “Explore apps” tab, so I suppose it’s a common bug.

Any idea on its origin? On how to fix or bypass it?