Sporadic crashes in MiniEngine caused by bug in code

The D3D12RaytracingMiniEngineSample project sporadically crashes from time to time.
This is caused by a bug in the code in ModelViewer.cpp, function InitializeRaytracingStateObjects():

D3D12_STATE_SUBOBJECT &rayGenDxilLibSubobject = subObjects.back();
...
rayGenDxilLibSubobject = CreateDxilLibrary(rayGenShaderExportName, g_pRayGenerationShaderLib, sizeof(g_pRayGenerationShaderLib), rayGenDxilLibDesc, rayGenExportDesc);
...
D3D12_STATE_SUBOBJECT hitGroupLibSubobject = CreateDxilLibrary(closestHitExportName, g_phitShaderLib, sizeof(g_phitShaderLib), hitGroupDxilLibDesc, hitGroupExportDesc);
subObjects.push_back(hitGroupLibSubobject);
...
rayGenDxilLibSubobject = CreateDxilLibrary(rayGenShaderExportName, g_pRayGenerationShaderSSRLib, sizeof(g_pRayGenerationShaderSSRLib), rayGenDxilLibDesc, rayGenExportDesc);

The problem is that the code saves a reference to an element in a vector, but the vector is resized and the reference is no longer valid, and the assignment later on can crash the app.