Steps to reproduce:
- Login with Admin account.
- Create a global user.
- Create a new sub wiki.
- After installation, go to Home -> Wiki index -> click on the new sub wiki installed.
- From the top menu, click on "Administer wiki"
- Choose Wikis -> Descriptor
- Below Owner section, search for a user from step 2 and click on it.
- Press "Save" button.
- Refresh the page or click on an other section.
- The old owner has not been changed with the new user searched on step 2.