java.lang.NullPointerException: Attempt to invoke interface method 'android.os.Bundle com.android.vending.billing.IInAppBillingService.a(int, java.lang.String, java.lang.String, java.lang.String)' on a null object reference

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Attempt to invoke interface method 'android.os.Bundle com.android.vending.billing.IInAppBillingService.a(int, java.lang.String, java.lang.String, java.lang.String)' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'android.os.Bundle com.android.vending.billing.IInAppBillingService.a(int, java.lang.String, java.lang.String, java.lang.String)' on a null object reference
at com.android.vending.billing.util.IabHelper.queryPurchases(IabHelper.java:822)
at com.android.vending.billing.util.IabHelper.queryInventory(IabHelper.java:526)
at com.android.vending.billing.util.IabHelper.queryInventory(IabHelper.java:505)

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