Crash when connect/disconnecting a node to colour socket in Emission node.

[sandyadr]

Steps to reproduce:

• Go to display rendered preview mode or material preview mode
• add an emission node
• connect something (texture, colour, etc) to emission node colour socket
• blender crash/quit immediately

it doesn't happen if the colour socket is connected in solid mode then go to rendered/material preview mode after it.

OS: Win 10 Blender version: 2.93.0 LTS LuxCore version: 2.6 alpha