QtCreator crashes when closing SCXML state chart

After updating to QtCreator 8.0.0 (came with Arch Linux update) I noticed that QtCreator reproducibly crashes with segmentation fault after closing certain scxml state charts (not all, but most included in my project). I tried to reduce complexity of one of the affected state charts as much as I could and created a "test.scxml".

Steps to reproduce:
1. Open the attached state chart "test.scxml" in QtCreator
2. Close the state chart
3. wait 1-2 sec. until QtCreator crashes with segmentation fault

This bug was not present in QtCreator 7.0.2