Steps to reproduce:

1. Create new menu item
2. Choose Contacts > List Contacts in a Category
   
3. Add a title to the menu item
4. Save the menu item

Desired result:
Menu item should be stored on the DB and the menu item title should show in the Title input field.

Actual result:
The menu item is not saved, the title field is blank and a warning message is thrown.

Server environment:
Joomla 3.4.2
MySQL 5.5.43
PHP 5.5.9
Apache 2,4.c

Client environment:
Safari 8.0.7 on Mac OSX 10.9

Screenshot:
https://www.dropbox.com/s/ki0h6ilckkfkxpi/Screenshot%202015-07-01%2021.14.52.png?dl=0