Switching framegraph crash (Fallback Layer)

[MeineZ]

Describe the bug
Wisp crashes when running Wisp on a machine that doesn't support DXR (so only supports the Fallback Layer) and switching framegraph to any framegraph that is using an Acceleration Structure.

To Reproduce
Steps to reproduce the behavior:

1. Run Wisp
2. Press F2 to switch framegraph
3. Experience the crash

Expected behavior
Just switch framegraph. No crash should be involved.

Screenshots

Deepest error location

Deepest 'high level' error location

Callstack

System (please complete the following information):

• OS: Windows 10
• NVIDIA GeForce GTX 1050
• RAM 16GB

[161563]

I think this is ray-tracing/fallback crashing, not the framegraph switching.

[161563]

just tested it, when using hybrid as the startup framegraph it crashes as well, so it's an issue in ray-tracing/fallback, not the framegraph.