ASSERT in scenegraph/qsgbasicinternalrectanglenode.cpp: "index == vertexCount" with angle==NaN

I have an existing Qt application that runs on Android just fine. I compiled it for iOS and get an ASSERT fired in schenegraph when app starts. As it is quite a big application with extensive use of QML, it can take some time to actually understand which code exactly causes this assert to fire.

I you have any hints on where to start looking at, that'd be great.

I exported crash log from device and attached a screenshot of the call stack. I am not familiar with Xcode very well, so I don't know what else I can attach.