'Error rewriting document' when typing "." to component -> type in property editor

Steps to reproduce:

• Create a project
• Add Rectangle component to Navigator
• Choose the added rectangle and in property editor, double click in Component - Type
• Type . 
• Don't choose anything from the drop down menu that opens
• Click somewhere outside property editor, e.g. in Navigator
• -> 'Error rewriting document' dialog appears, added rectangle is removed from Navigator