ID 142152 - A crash occurs when moving vertices of the GridWarp while viewing the Keymix node in the attached script

Problem summary:
A crash occurs when moving vertices of the GridWarp while viewing the Keymix node in the attached script.

Customer reported version:
nuke.11.3v4

Customer reported platform:
windows10

Steps to reproduce:

1) Launch Nuke and open the attached script. 

2) Locate and open the GridWarp3_2 node in the properties bin.

3) Move any point in the Viewer and observe performance

Expected behavior:
The script should remain stable when moving vertices in the Viewer with the active GridWarp node.

Actual behavior:
Nuke crashes when moving vertices in the Viewer when the GridWarp node is active and viewing the Keymix node.

Workaround:
Enabling the Merge3 node while viewing the Keymix node does not cause a crash when moving a point in the Viewer.

Reproduced by Support in:

Nuke 11.3v4 - Windows 10, CentOS 7, macOS 10.13

Nuke 11.3v1 - Windows 10

Nuke 11.2v1 - Windows 10

Nuke 11.1v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.5v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke 9.0v1 - Windows 10

Nuke 8.0v1 - Windows 10, CentOS 7, macOS 10.13

Earliest version tested:
Nuke 8.0v1 - This issue appears to be in all versions of the product