[Therion] Therion crashes in shapes.h when generating 3D

[Michael]

Hello,
Seeking advice from Therion developers how to track down the cause of attached crash report, and apply possible workaround.
Only happens when generating 3D of any format.
Producing plans (pdf, kml) works.
I'm running Therion 5.4.1 on Windows 7.
The crash seems unrelated to the last scrap processed before the crash,
because when I exclude that scrap, it crashes after approx. the same time with a different one.

Any help appreciated,
Michael.
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