Steps to reproduce:
1. Open attached project "KeyboardCrash.zip"
2. Build and run on certain Android devices (shown below)
3. Select the InputField, select all text and press OK button
4. Application crashes

Expected: The app does not crash
Actual: After selecting the text and pressing OK the app crashes

Reproduced on Unity: 5.5.5f1, 5.6.3p4, 2017.1.1p3, 2017.2.0f2, 2017.3.0b2

Devices that reproduce the issue:
Xperia XZ　Premium　SO-04J(Android7.1.1)
Xperia XZs SOV35 (Android7.1.1)
Xperia XZs 602SO (Android7.1.1)
Xperia X Performance SOV33 (Android 7.0)
Samsung GalaxyS7 SM-G930F (Android 7.0.1 )

Devices that don't:
Samsung Galaxy S7 Verizon SM G930V (Android 6.0.1)
Sony Xperia (Z3D6603) (Android 5.1.1)
Samsung GalaxyS8 SM-G950F (Android 7.0)
Samsung GalaxyS6 SC-05G (Android 7.0)
Google Pixel* (Android 8.0)
Meizu MX5 (Android 5.0.1)
HUAWEI EVA L19 (Android 7.0)
Lge LG H815 (G4) (Android 6.0)

Note:
This bug happened on some "Galaxy" and "Xperia" with Android 7.0.
And I found that if we change Android's "Default Keyboard" from settings, the bug won't happen