ID 486028 - Selecting Fusion Mesh items from the Viewport, then interacting with Modo's UI, results in an error

Problem summary
Selecting Fusion Mesh items from the Viewport, then interacting with Modo's UI, results in an error:

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Customer reported version
Modo 15.1v1

Customer reported platform
windows10

Steps to reproduce

1) Open Modo.

2) From the Item List, create 2 Mesh Items.

3) From the Create tab, add a primitive to each Mesh item.

4) In the Properties panel (lower-right), select the Fusion tab.

5) Select both Mesh items in the Viewport.

6) In the Fusion tab, press New Fusion.

NOTE: At this point, it is not possible to select the Fusion Item from the Viewport. However, trying to do so then clicking any options outside of the Viewport will also result in an error.

8) With the Fusion Item selected in the Item List, navigate to Properties > Output Mesh and click Convert to Mesh Item.

9) Lasso select the Fusion Mesh item in the Viewport.

10) Try to interact with the UI, outside of the Viewport, and notice that the following error occurs:

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Expected behaviour
Selecting Fusion Mesh items from the Viewport, then interacting with Modo's UI, should not display an error dialog.

Actual behaviour
Selecting Fusion Mesh items from the Viewport, then interacting with Modo's UI, results in an error.

Workaround
If you select the Fusion Mesh item from the Item List, the error does not occur.

Reproduced by support
This bug has been reproduced in:
Modo 15.1v1 - Windows 10 - Regression

Unable to reproduce bug in:
Modo 15.0v3 - Windows 10

Earliest version tested
Modo 15.0v3
- This issue doesn't appear in this version and has regressed