Null Pointer Exception

[smks]

I can see there is a pull request that seems to fix this issue. Can it be approved???

java.lang.NullPointerException: Attempt to invoke virtual method 'void org.haxe.extension.iap.util.IabHelper.launchPurchaseFlow(android.app.Activity, java.lang.String, int, org.haxe.extension.iap.util.IabHelper$OnIabPurchaseFinishedListener, java.lang.String)' on a null object reference
at org.haxe.extension.iap.InAppPurchase$1.run(InAppPurchase.java:39)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)