Delete Session is not working/or causes crash

To observe:
1. Create a new regular attendance session
2. add some attendance
3. Edit the session
4. click Delete
5. Note the warning and result: Delete does not occur (as expected)
6. Open the attendance for that session again
7. uncheck all attendance
8. Edit the session
9. Click Delete
10. Note the warning
11. Pull down (refresh) the Sessions view
Result:
Crash/Hang

The session may be deleting and reloading incorrectly