How to reproduce:
1. Create a new project
2. Open 'SampleScene'
3. Open Window > Analysis > Profiler
4. Capture some data by entering the Play mode
5. In the Module details panel set the view option to 'Hierarchy'
6. In the search bar enter 'Profiler'
7. Select any item in the filtered list
8. Clear the search bar by clicking on 'x' (located on the right side of the search bar)
9. Observe the Console

Expected result: No visible errors present
Actual result: NullReferenceException appears in the Console

Reproducible with: 2020.2.0b9, 2020.2.0f1
Not reproducible with: 2018.4.30f1, 2019.4.17f1, 2020.1.17f1, 2020.2.0b8, 2021.1.0a10

Notes:
- After clearing the search bar the list is not returned to the original state