"Qt Project Settings" menu does not open, stops with error.

For most of the project files I use, the "Qt Project Settings" dialog does not open anymore in Version 2.7.2. It did without any problems in Version 2.7.1.

Steps to reproduce:

• Open the attached visual studio project.
• Right click on the project and select "Qt"->"Qt Project Settings"

Expected Result:

• The dialog with the project settings open.

Actual Result:

• An error dialog with the message "Object reference not set to an instance of an object." is displayed.