Steps to reproduce:
1. Open user OC attached project
2. Switch platform to Android
3. Select "HowToPlay" sprite atlas
4. Click on "Pack Preview"
- Crash occurs at this point

0x0000000141C6AFBF (Unity) crnlib::crn_comp::append_chunks
0x0000000141C6B381 (Unity) crnlib::crn_comp::create_chunks
0x0000000141C6B423 (Unity) crnlib::crn_comp::compress_internal
0x0000000141C6BA1D (Unity) crnlib::crn_comp::compress_pass
0x0000000141C52498 (Unity) crnlib::create_compressed_texture
...

Reproduced in: 2018.3.0a4, 2017.2.0p2, 2017.1.0b10, 2017.1.0b3
No repro in: 2017.1.0b2, 2017.1.0a6
Regression since: 2017.1.0b3

Reproduced on Android platform
Not reproduced on Windows Standalone, iOS, WebGL platforms