diff --git a/RNBeacon.m b/RNBeacon.m
index 4faf0df..72fc92d 100644
--- a/RNBeacon.m
+++ b/RNBeacon.m
@@ -232,6 +232,10 @@ -(void) locationManager:(CLLocationManager *)manager didRangeBeacons:
 
 -(void)locationManager:(CLLocationManager *)manager
         didEnterRegion:(CLBeaconRegion *)region {
+    if (! [region respondsToSelector:@selector(proximityUUID)]) {
+        return;
+    }
+
     NSDictionary *event = @{
                             @"region": region.identifier,
                             @"uuid": [region.proximityUUID UUIDString],
@@ -242,6 +246,10 @@ -(void)locationManager:(CLLocationManager *)manager
 
 -(void)locationManager:(CLLocationManager *)manager
          didExitRegion:(CLBeaconRegion *)region {
+    if (! [region respondsToSelector:@selector(proximityUUID)]) {
+        return;
+    }
+
     NSDictionary *event = @{
                             @"region": region.identifier,
                             @"uuid": [region.proximityUUID UUIDString],