ID 458419 - Crash when trying to "Cancel Drop" on a plugin button that is no longer working.

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Problem summary
Crash when trying to "Cancel Drop" on a plugin button that is no longer working.

Customer reported version
modo.14.1v2

Customer reported platform
10.15

Steps to reproduce

1) Watch the attached video and trying using "Cancel Drop" on a plugin.

Expected behaviour
It should cancel the drop.

Actual behaviour
Modo crashes.

Workaround
Unknown. 

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