Steps to reproduce:
1. Open QA attached project (from OC link)
2. Make sure to have Facebook Messenger installed
3. Build and run to device or just use the build already in the attachment
4. Press the Send Message button, this will open messenger
5. Log into messenger with credentials provided in the edit field
6. Send the message to yourself (The test account)
7. Go back and open Messenger normally
8. Open the link you sent to yourself by clicking the "Reply" button
9. The Unity app that was running in the background will crash

Expected: If there is an app running already detected, the intent does not crash the app, but just opens it
Actual: If you try to have the app running in the background, but also call it from messenger, app crashes

Reproduced on:5.6.5p1, 2017.1.3f1, 2017.2.1p2, 2017.3.0f3, 2018.1.0b4

Devices Under Test:
Repro:
Samsung SM N910F (Galaxy Note 4), OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 420, Build:samsung/trltexx/trlte:6.0.1/MMB29M/N910FXXS1DQE1:user/release-keys
Google Nexus 6P, OS:7.1.2, CPU:arm64-v8a, GPU:Adreno (TM) 430, Build:google/angler/angler:7.1.2/N2G48C/4104010:user/release-keys
Google Pixel 2, OS:8.1.0, CPU:arm64-v8a, GPU:Adreno (TM) 540, Build:google/walleye/walleye:8.1.0/OPM1.171019.013/4474084:user/release-keys
Samsung SM G928F, OS:7.0, CPU:arm64-v8a, GPU:Mali-T760, Build:samsung/zenltexx/zenlte:7.0/NRD90M/G928FXXS3CQL2:user/release-keys
Motorola XT1032, OS:5.1, CPU:armeabi-v7a, GPU:Adreno (TM) 305, Build:motorola/falcon_retuglb/falcon_umts:5.1/LPBS23.13-58-2/2:user/release-keys

No repro:
Samsung GT N7100 (Galaxy Note 2), OS:4.4.2, CPU:armeabi-v7a, GPU:Mali-400 MP, Build:samsung/t03gxx/t03g:4.4.2/KOT49H/N7100XXSFQA1:user/release-keys
Google Galaxy Nexus*, OS:4.3, CPU:armeabi-v7a, GPU:PowerVR SGX 540, Build:google/yakju/maguro:4.3/JWR66Y/776638:user/release-keys