[Flutter] Flutter app is closed after request REQUEST_INSTALL_PACKAGES permission

I am using the permission-handler package to get requestInstallPackages. but after await Permission.requestInstallPackages.request(); and returning to my application my application is closed and I for this message:

MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=212, result=-1, data=null} to activity .../com.....MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.PackageManager android.app.Activity.getPackageManager()' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4469)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4506)
at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2081)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7719)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=212, result=-1, data=null} to activity {com...../com.....MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.PackageManager android.app.Activity.getPackageManager()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:5061)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4456)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4506)
at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2081)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7719)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.PackageManager android.app.Activity.getPackageManager()' on a null object reference
at com.baseflow.permissionhandler.PermissionManager.onActivityResult(PermissionManager.java:97)
at io.flutter.embedding.engine.FlutterEngineConnectionRegistry$FlutterEngineActivityPluginBinding.onActivityResult(FlutterEngineConnectionRegistry.java:774)
at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.onActivityResult(FlutterEngineConnectionRegistry.java:422)
at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onActivityResult(FlutterActivityAndFragmentDelegate.java:964)
at io.flutter.embedding.android.FlutterActivity.onActivityResult(FlutterActivity.java:911)
at android.app.Activity.dispatchActivityResult(Activity.java:8353)


Some one know how can I fix it ?

Continue reading...