Unity Crashes when AudioGroup's Effects array size is changed to 0, and then to any size.

Steps to reproduce:
1. Open a new project
2. Create an Audio Mixer
3. Expand Audio Mixer
4. Click on Master AudioGroup
5. In inspector window, change view from Normal mode to Debug mode.
6. Expand Effects array > change array size to 0 > change array size to any size
Observe that Unity freezes and crashes in a bit

Actual Result:
Unity Crashes when Effects array is resized from 0 to any size.

Expected Result:
Crash shouldn't occur when array is resized.

Reproducible on:
2019.1.0a9, 2018.3.0b11, 2018.2.0f2, 2018.1.0f2, 2017.4.15f1

Environment:
Windows 7, Windows 10 and Mac 10.13.