#382

- PurchaseController: added mHelper null check to the setup method

app/src/com/trovebox/android/app/purchase/PurchaseController.java

@@ -131,8 +131,18 @@ public class PurchaseController {
                 // Hooray, IAB is fully set up. Now, let's get an inventory of
                 // stuff we own.
                 CommonUtils.debug(TAG, "Setup successful. Querying inventory.");
+                // need to check whether mHelper is not null. It may be null in
+                // case parent activity was destroyed such as action is async.
+                // Issue #382
+                if (mHelper != null)
+                {
                     mHelper.queryInventoryAsync(new GotInventoryListener(loadingControl),
                             loadingControl);
+                } else
+                {
+                    TrackerUtils.trackInAppBillingEvent("setup_result",
+                            "fail: helper is null");
+                }
             }
         });
     }