Deleted simple members prevent creation of new ones with identical name

I tested out your nice app and found a bug that I thought I'd report.

Procedure:

1. Create new project
2. Create simple member
3. Delete member
4. Create new member with same name

Result: New member cannot be created because that member "already exists". Problem persists after refresh of page.

Other Observations: Creating a new simple member with a different name and renaming it to the previously deleted one works.