Crash changing arty target

[Paganus]

I've had this one happen a few times now. In the F10 screen I click the arty unit and the target marker I placed earlier appears. I click and hold the mouse button and drag the target reticle to the new location <CRASH>

 

It doesn't happen every time or even most of the time. I moved markers for arty and MRLS units at least 10 times before this crash.

 

I'm wondering if it has something to do with where the unit is in its firing cycle at the moment I drag the targeting reticle.

crash.zip