[Reg 5.7->5.8] Crash when model contains array data

This is regression from Qt 5.7 to 5.8.

Steps to reproduce the issue:
1. Run attached test application
2. Click "Open page" button
3. Click on "Pop" button

Expected outcome:
Application doesn't crash

Actual outcome:
Application crashes

Notes:
When the array is commented out from the test application the crash doesn't occur. Also enabling dynamicRoles seems to work as a workaround.

Tested on:
macOS 10.11 -> crashes every time
Windows -> crashes 1/3 times