On creating New Node from "Output Mesh Node" in VFX Graph editor throws NullReferenceException in the console, refer the attached video.

Steps to repro:
1. Create a new Project
2. Windows > Package Manager > VFX Graph > Install
3. Project Window > Right Click > Create > Visual Effect
4. Double click on it to open the VFX editor
5. VFX editor > Right Click > Create node > Context > Output Mesh > Select
6.Try to create a new node from Output Mesh and press Enter key

Actual Result:
NullReferenceException is thrown on a new node is created from Output Mesh Node in VFX Graph

Expected Result:
No Error in the console

Reproducible On:
2020.2.0a7 with Package Version Preview.13 - 9.0.0, 8.0.1, 7.1.7
2020.1.0b5 with Package Version Preview.13 - 9.0.0, 8.0.1
2019.3.0b4 with Package Version 7.1.5

Not Reproducible in:
2019.3.0b4 with Package Version 7.1.2

Environment:
Windows10 and macOS 10.14