Calling Android native function that returns null through AndroidJavaObject.CallStatic<object> method crashes application
Steps to reproduce:
1. Open attached project "RefExp2"
2. Build and run on Android
-Inspect logcat for crash logs (Application screen will also turn black)

Reproduced with: 2018.2.0a1, 2018.2.1f1, 2018.3.0a7
Didn't reproduce with: 2017.3.2f1, 2017.4.9f1, 2018.1.8f1
Regressed in: 2018.2.0a1

Devices under test:
VLNQA00031, Lge Nexus 5 (Nexus 5), 6.0.1, CPU: Snapdragon 800 MSM8974, GPU: Adreno (TM) 330
VLNQA00002, Samsung Galaxy S5 Neo (SM-G903F), 6.0.1, CPU: Exynos 7 Octa 7580, GPU: Mali-T720
VLNQA00025, Xiaomi Mi 5s (MI 5s), 6.0.1, CPU: Snapdragon 820 MSM8996, GPU: Adreno (TM) 530
Google Emulator (Android SDK built for x86), 8.0.0, GPU: Android Emulator OpenGL ES Translator (AMD Radeon (TM) R7 360 Series)