ID 393414 - Crash when scrubbing through the timeline while the adjust weights tool is active.

Problem summary

When scrubbing through the timeline when the Adjust Weights tool is active, releasing the mouse button results in a crash.

Customer reported version
modo.13.0v1

Customer reported platform
10.13

Steps to reproduce

1) Download and open the attached scene.

2) Navigate to the Front view and select the Setup layout.

3) Go into Vertices mode and select some of the vertices.

4) Go to the weighting tab and set the Weight Maps to TestWeight.

5) Toggle Adjust Weights and then scrub through the timeline, when you release the left-mouse button Modo will crash.

Expected behaviour
For Modo to scrub through the timeline without an issue.

Actual behaviour
Modo crashes when the left-mouse button is released.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:

Modo 13.0v1 - Windows 10 - Centos 7 - MacOS 10.13

Modo 12.2v2 - Windows 10

Modo 12.1v2 - Windows 10

Modo 12.0v1 - Windows 10

Modo 11.2v3 - Windows 10

Modo 11.2v1 - Windows 10 - Centos 7 - MacOS 10.13 - regression

Unable to reproduce bug in:

Modo 11.1v1 - Windows 10 - Centos 7 - MacOS 10.13

Earliest version tested
Modo 11.1v1 - This issue no longer appears in this version and has regressed.