How to reproduce:
1. Open attached project "Projected Grid.zip" and scene "SampleScene"
2. In Hierarchy window, delete all children of "AQUAS Container"
3. Open Window -> AQUAS -> Setup Wizard
4. In AQUAS window, press "Add Water" -> "Add Anyways"
5. In AQUAS window, switch tab from "Water Setup" to "Underwater Setup"
6. Switch "Select type of underwater" from "Simple" to "Advanced" and press "Add Underwater Effects"
7. In Hierarchy window, select "AQUAS Container" child "AQUAS Waterplane 0"
8. In Inspector window, add "CameraLock" component
9. In CamLock component, enable "Use Dynamic Mesh"
10. Enter Play mode
11. Observe the Editor

Expected result: Play mode is active
Actual result: Editor crashes

Reproducible with: 2018.4.16f1, 2019.2.19f1, 2019.3.0f6, 2020.1.0a20
Could not test with: 2017.4.36f1 (the Editor does not crash but the water does not look as it should, most likely something in the project is broken)