To reproduce:

1.Download godkingsprojekt-smaller.zip from OwnCloud.
2.Unzip and load the project in the Editor.(Project is located in godkingsprojekt\frontend folder).
3.Connect suitable android device.
4.Run IG Tools | Build | Build Android Fast.
5.After step 4 application should be installed in your connected device. If not install the apk manually.
6.Turn on the application.
7.Background it by pressing home button.
8.Then quickly turn the app back again.
9.Repeat steps 7-8 until the app crashes.

Expected result: App does not crash when switching its state from backgrounded to active.
Actual result: App crashes.

Reproduced with : 5.4.4p3.

DUT:

Sony D6603 (Xperia Z3), OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 330, Build:Sony/D6603/D6603:5.1.1/23.4.A.1.264/2418263178:user/release-keys

Xiaomi MI 5s, OS:6.0.1, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:Xiaomi/capricorn/capricorn:6.0.1/MXB48T/V8.0.10.0.MAGCNDH:user/release-keys

Samsung SM G361F, OS:5.1.1, CPU:armeabi-v7a, GPU:Vivante GC7000UL, Build:samsung/coreprimeveltexx/coreprimevelte:5.1.1/LMY48B/G361FXXU1APB1:user/release-keys

Notes: Could not test on other Unity versions because of compatibility issues.

Verified with 2017.1.0p4