can't run in android platform, report null pointer error, how to fix it

09-18 11:09:58.346 16305-16305/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.star.webviewtest, PID: 16305
java.lang.Error: FATAL EXCEPTION [main]
Unity version : 5.6.1p4
Device model : samsung SM-N920S
Device fingerprint: samsung/noblelteskt/noblelteskt:7.0/NRD90M/N920SKSU2DQL1:user/release-keys

                                               Caused by: java.lang.RuntimeException: Unable to resume activity {com.star.webviewtest/net.gree.unitywebview.CUnityPlayerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.unity3d.player.k.b(boolean)' on a null object reference
                                                   at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3791)
                                                   at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3832)
                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2994)
                                                   at android.app.ActivityThread.-wrap14(ActivityThread.java)
                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
                                                   at android.os.Handler.dispatchMessage(Handler.java:102)
                                                   at android.os.Looper.loop(Looper.java:154)
                                                   at android.app.ActivityThread.main(ActivityThread.java:6682)
                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
                                                Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.unity3d.player.k.b(boolean)' on a null object reference
                                                   at com.unity3d.player.UnityPlayer.resume(Unknown Source)
                                                   at com.unity3d.player.UnityPlayerActivity.onResume(Unknown Source)
                                                   at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1277)
                                                   at android.app.Activity.performResume(Activity.java:7088)
                                                   at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3768)
                                                   at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3832) 
                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2994) 
                                                   at android.app.ActivityThread.-wrap14(ActivityThread.java) 
                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631) 
                                                   at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                   at android.os.Looper.loop(Looper.java:154) 
                                                   at android.app.ActivityThread.main(ActivityThread.java:6682) 
                                                   at java.lang.reflect.Method.invoke(Native Method) 
                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) 
                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) 

Reproduce the crash on Android with Unity 5.6.1p4 and inspect the stack trace from CUnityPlayerActivity.onResume through UnityPlayer.resume. Start by checking the Android activity lifecycle and the initialization associated with the reported null object. Done means the application resumes without the reported NullPointerException.