Reproduce: Login into your CMS account with your user and password, go to "extend" menu and select "Site Page Types".
Create a new page type, save. Click on the page type you has just create, try to edit the information:
If you change just the "name" and update -> Uncaught Exception.
If you change just the "slug" and update -> Uncaught Exception.
If you don't change anything and update -> Uncaught Exception.
If you change both of the fields -> No problem but the system does nothing.
Working on 0.10-dev branch.
Reproduce: Login into your CMS account with your user and password, go to "extend" menu and select "Site Page Types". Create a new page type, save. Click on the page type you has just create, try to edit the information:
If you change just the "name" and update -> Uncaught Exception. If you change just the "slug" and update -> Uncaught Exception. If you don't change anything and update -> Uncaught Exception. If you change both of the fields -> No problem but the system does nothing.