Crash when TextMesh pro is removed and added back to Packman Manager

Steps to Reproduce:
1. Open a new project.
2. Go to Windows->Package Manager
3. Go to InProjects tab and select TextmeshPro.
4. Remove it and try to add it again.

Unity Editor is crashing while adding Textmeshpro component again.

Working Fine :
2018.1.0b11, 2018.1.0b10

Reproduce On:
2018.2.0a3, 2018.2.0a2

Environment:
Occurring only on Windows