ID 416702 - Adding a locator to imported materials crashes Mari when using the Projection node and promoted attributes

Problem summary

Adding a locator to imported materials crashes Mari when using the Projection node and promoted attributes 

Customer reported version
mari.4.6v1

Customer reported platform
windows10

Steps to reproduce

1) Download the attached .mma file.

2) Open Mari and select Shelf, go to the Personal tab and drag and drop the material

3) Go to the Layer stack and drag/drop this material inside. 

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4) Click on the '+' next to the dropdown to add a locator. Mari will crash.

Expected behaviour
Mari should add a locator.

Actual behaviour
Mari crashes.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:

4.6v1 - Windows 10 - CentOS 7 

Earliest version tested

4.6v1 - This feature did not exist before this version.