Steps to reproduce:
1. Open user-supplied project ("TEST.zip")
2. Enter/Exit Play mode

Reproduced in: 2019.1.0b10, 2019.2.0a2
Not reproduced in: 2017.4.21f1*, 2018.3.12f1**

HDRP versions
Reproducible: 5.7.1, 5.8.2, 5.9.0, 5.10.0
5.7.2: Console started throwing "NullReferenceExceptions" and "RTHandle.Initialize should only be called once before allocating any Render Texture"

For some reason, Packman does not allow to go below 5.7.2

Note:

*HDRP is not yet introduced
**Compile errors
Could not reproduce on a new project, but the user's project looks like a new HDRP project with some Sample Assets which is as close to a new project as you can get.