How to reproduce:
1. Open attached "CrashProject"
2. Build and run Player on Android device
3. Click on "UnityWebRequest" button
4. Observe that some files are downloaded, wait for application to crash(usually it happens when first few files are downloaded, a few minutes after the launch)

Result - Application crashes or freezes

Reproducible with - 2018.2.0b1, 2018.1.0f1, 2017.3.2f1, 2017.3.0a1

DUT:
Reproducible with:
Xiaomi Redmi Note 4*, OS:7.0, CPU:arm64-v8a, GPU:Adreno (TM) 506, Build:xiaomi/mido/mido:7.0/NRD90M/V8.5.4.0.NCFMIED:user/release-keys
Samsung SM G903F*, OS:6.0.1, CPU:armeabi-v7a, GPU:Mali-T720, Build:samsung/s5neoltexx/s5neolte:6.0.1/MMB29K/G903FXXU1BQC1:user/release-keys
Samsung SM G903F*, OS:6.0.1, CPU:armeabi-v7a, GPU:Mali-T720, Build:samsung/s5neoltexx/s5neolte:6.0.1/MMB29K/G903FXXU1BQC1:user/release-keys
iPhone 5s iOS 9.3.3

Not reproducible with:
Google Pixel 2*, OS:8.1.0, CPU:arm64-v8a, GPU:Adreno (TM) 540, Build:google/walleye/walleye:8.0.0/OPD1.170816.010/4311506:user/release-keys
Samsung SM G928F*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T760, Build:samsung/zenltexx/zenlte:7.0/NRD90M/G928FXXU3CQG2:user/release-keys
Xiaomi MI 5*, OS:6.0.1, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:Xiaomi/gemini/gemini:6.0.1/MXB48T/V8.1.2.0.MAAMIDI:user/release-keys