To reproduce:

1. Download attached project "AddressableBug.zip" and open in Unity
2. Open "SampleScene" scene
3. Select "New Test Scriptable" in Project window
4. Try to expand the lists of "Inner" in Inspector window

Expected result: The lists expand successfully and reveal more lists
Actual result: Expanding lists reveal blank spaces and in Console there will be printed errors

Notes:
- This issue appears on Windows and OSX
- Errors are shared in Comments section
- Each "Inner" contains an "AssetReference" to be drawn, but because the drawing code is trying to find "innerRef" on the outer "target" that is currently the highlighted New Test Scriptable, there is no such field on the scriptable object
- Could not check for regression between Unity 2018.2.0b2 and 2018.2.0b9 because the project becomes corrupted

Reproduced on Unity 2018.2.0b9, 2018.2.8f1, 2018.3.0b2 and 2019.1.0a1
Not reproduced on Unity 2018.1.9f2 and 2018.2.0b2
Regression is somewhere between Unity 2018.2.0b2 and 2018.2.0b9