java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.radiusnetworks.ibeacon.Region.equals(Region.java:149)
at java.util.ArrayList.remove(ArrayList.java:418)
at com.radiusnetworks.ibeacon.IBeaconManager.stopMonitoringBeaconsInRegion(IBeaconManager.java:480)

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