java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.altbeacon.beacon.Identifier.toString()' on a null object reference

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Attempt to invoke virtual method 'java.lang.String org.altbeacon.beacon.Identifier.toString()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.altbeacon.beacon.Identifier.toString()' on a null object reference
at com.mmazzarolo.beaconsandroid.BeaconsAndroidModule.createRangingResponse(BeaconsAndroidModule.java:233)
at com.mmazzarolo.beaconsandroid.BeaconsAndroidModule.access$300(BeaconsAndroidModule.java:35)
at com.mmazzarolo.beaconsandroid.BeaconsAndroidModule$2.didRangeBeaconsInRegion(BeaconsAndroidModule.java:226)
at org.altbeacon.beacon.BeaconIntentProcessor.onHandleIntent(BeaconIntentProcessor.java:65)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.os.HandlerThread.run(HandlerThread.java:61)

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