Reproduction steps:
1. Open the attached project;
2. Open the SharingTest scene;
3. In the Menu, choose HoloToolkit -> Sharing Service -> Launch Sharing Service;
4. Then press Build Window;
5. Choose one of build option, does not matter which;

Expected results: the project should be built without any crashes.
Actual results: the editor crashes.

Reproduced on: 5.5.3p3, 5.6.0f3, 5.6.1f1, 2017.1.0b5.

Note: if the sharing service is off, it builds as it should.

Update: does not occur on 2017.3