I looked into the issue,but its working fine for me using 15.2.2 as well as 15.4 SDK.
Only diff I noticed is on 15.2.2 following exception ( but it did not crash the app ) :
E java.io.FileNotFoundException: https://www.telefonicamovistar.com.pe/ColProxyAppMB/GestorHome/ObtenerHome/1/Android
E at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:206)
E at com.android.okhttp.internal.http.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
On 15.4 its not throwing this error which looks like AJAX request which we are able to intercept properly in 15.4
But in either case app is not crashing, I doubt if you made some syntax error or JS file dependency related error when using JS Integration.
Please send me your version of wrapped apk ( the one in which you have added code & JS, HTML ) to verify.