HTML Architect: Cannot open a Data Constant editor

Opening the editor of any Data Constant in the HTML Architect returns a server error 500 and the editor never opens.

There are two separate errors, one after the other:

  1. The duplicate name check fails - happens for every Data Constant.
  2. Loading the drop-down values fails - happens for constants of type Boolean or with a lookup assigned.

Reproducible on current master. Not related to moving items between packages, that is just how I ran into it.

Does anyone else run into this? I think I can fix it quickly, I would estimate the effort as S.

I can try to reproduce it today