Qt3D access violation (SIGSEGV) while closing example application

Ran a few Qt3D examples with the mingw toolchain (both 32b/64b) to get started as a noob.

Although the program runs fine, it crashes with an AV (SIGSEGV) when you close the application.

Affected are for instance scene3dview and the basic simple-qml examples.

The crash happens when the rendering thread is cleaning up and destroying its objects.

When I remove the material from the scene/QML-file it closes okay.

It looks like the program is trying to use a GLShader object after it has already been freed.

This kind of rhymes with my observation that removing the material from the scene avoids the crash, since there is no use-after-delete possible without any materials in the first place.