ID 249057 - Nuke crash shuffling rgb->smartvector

Problem summary
Shuffle from, then to smartvector layer crashes

Customer reported version
nuke.10.0v4

Customer reported platform
n_a_linux

Steps to reproduce

1)
Render a SmartVector node, or create a Read containing a smartvector-produced EXR sequence
2)
Shuffle the channels from "smartvector -> rgba"

3)
Shuffle the rgba channels back to the smartvector layer

Workaround
Unknown. 

Reproduced by support
OS 10.10.5
Nuke10.0v4, 10.5v1

Expected behaviour
channel layers shuffled

Actual behaviour
crash