Unexpected exit of Creo from Generative design, Generate design step 6

I'm using using Generative design and sometimes, when generating the solid part(Generate design), something happens at step 6 causing Creo to exit. Unfortunatelly no log file is written so I have no means of diagnosing why it happens. I've had similar exist on a few other detatils. Not many but still critical. Is this someone else has seen and know of a resolution to it?

Running Creo 9.0.1.0 and Windchill 12.0.2