How to reproduce:
1. Open user-submitted project (test.zip)
2. Open the Tests/Simple/Scene.scene
3. In Hierarchy window expand Graph and select 'TestVfx'
4. From Project window drag Tests/AudioWave/AudioWaveSceneVFX.vfx into the Asset Template field in the Inspector window

Expected result: the Editor does not crash
Actual result: the Editor crashes

Reproducible with: 2019.3.1f1(VFX Graph 7.2.0, 7.2.1), 2019.4.10f1(VFX Graph 7.3.1, 7.5.1)
Not reproducible with: 2019.3.1f1(VFX Graph 7.1.8), 2020.1.0a11(VFX Graph 7.2.0, 7.5.1), 2020.1.6f1(VFX Graph 8.2.0, 9.0.0-preview.54), 2020.2.0b3(VFX Graph 8.1.0, 10.0.0-preview.27)
Could not test with: 2018.4.27f1(VFX Graph version incompatible with the graph)

Notes:
With default layout the crash occurs upon selecting AudioWaveSceneVFX.vfx
2020.1.0a1-2020.1.0a9 could not be tested due to not supporting the regressed package version(7.2.0)