To reproduce:
1. Open attached project and build to Android
2. Make sure device is in the Airplane mode
3. Open application and choose "HelloAR" scene
4. To go back to main menu, press Android back with Android navigation bar button
5. Application will quit instead, try to re-open it.

Expected result - App is re-opened
Actual result - Application crashes

Devices under testing:
Reproducible with:
VLNQA00224, Samsung Galaxy A5(2017) (SM-A520F), Android 8.0.0, CPU: Exynos 7 Octa 7880, GPU: Mali-T830
VLNQA00010, Samsung Galaxy S8 (SM-G950U), Android 7.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00017, Huawei Nexus 6P (Nexus 6P), Android 8.0.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430
VLNQA00166, Huawei P20 (EML-L29), Android 8.1.0, CPU: HiSilicon Kirin 970, GPU: Mali-G72
VLNQA00118, Google Pixel 2 XL (Pixel 2 XL), Android 8.1.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00134, Samsung Galaxy S8 (SM-G950F), Android 8.0.0, CPU: Exynos 9 Octa 8895, GPU: Mali-G71
VLNQA00175, Samsung Galaxy Note 9 (SM-N960F), 8.1.0, CPU: Exynos 9 Series 9810, GPU: Mali-G72
VLNQA00202, Samsung Galaxy Note 9 (SM-N9600), 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630

Reproduced with: 2017.4.21f1, 2018.3.7f1 (application quits after pressing "back" button, but doesn't crash after reopening), 2019.1.0b4, 2019.2.0a6.