How to reproduce #1:
1. Open Unity launcher.
2. Select "Learn" tab.
3. Open any tutorial project.
4. Wait a little bit. The crash should appear sometime after assets' import.

How to reproduce #2:
1. Open a new project.
2. Go to Asset Store.
3. Download and import any (for example: http://u3d.as/15f1 ) project from "Complete Projects" category.

Expected result: Unity will open the selected project.
Actual result: Unity crashes while opening the project.

Reproducible with - 2018.2.0a4, 2018.2.0a5
Not reproducible with - 2017.3.2f1, 2018.1.0b11, 2018.2.0a1, 2018.2.0a3

Note:
- The crash happens when "Collecting content..." message is shown.