I can consistently reproduce the problem on my Android 7.0 emulator.
My App crashes on Android 7.0, if I have switched page and open Android 7.0's split screen.
Android 7.0
I don't know if it's caused by the same problem, but I've seen the error many times. But I haven't been able to reproduce it, making it hard to write a proper bug report on the issue.

I've added a test project here:
https://github.com/m-abs/ns-debugging/tree/master/crash-view-already-have-parent
Argh! So it's not only my app. I've been getting this a lot in the latest release of my app. (Logged in analytics).
Running vanilla NS v2.5.2
Core modules: v2.5.2
Android-runtime: v2.5.0
Didn't have to tap around: just start app, hold the "square" on first view and initiate the split-screen = crash.
Confirming this issue is reproducible with the template Angular app and pageTransition on nsRouterLink.
Test application can be found here.
This is probably related to how Android handles the activities on split screen and after app has been minimized and might be related to this one. In fact, if you set Developer options -> Don't keep activities option ON then the application will crash on split screen but will work on minimize. If the same options is OFF then the application will work on app minimize but will crash on the split mode.
@m-abs, @manijak as a temporary solution in order to avoid the app crashing runtime you can disable the split screen mode for your application. TO do so all you need to do is to provide a false boolean value for android:resizeableActivity key in your AndroidManifest.xml
e.g.
...
<activity
android:name="com.tns.NativeScriptActivity"
android:label="@string/title_activity_kimera"
android:configChanges="keyboardHidden|orientation|screenSize"
android:theme="@style/LaunchScreenTheme"
android:resizeableActivity="false">
@m-abs, @manijak just FYI - this issue is now resolved with NativeScript 3.x.x
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