1 files changed, 6 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLFillStyleLayer.mm b/platform/darwin/src/MGLFillStyleLayer.mm
index d1a96f7230..87a5144c6b 100644
--- a/platform/darwin/src/MGLFillStyleLayer.mm
+++ b/platform/darwin/src/MGLFillStyleLayer.mm
@@ -70,6 +70,12 @@ namespace mbgl {
 
 - (void)addToMapView:(MGLMapView *)mapView
 {
+    if (_pendingLayer == nullptr) {
+        [NSException raise:@"MGLRedundantLayerException"
+            format:@"This instance %@ was already added to %@. Adding the same layer instance " \
+                    "to the style more than once is invalid.", self, mapView.style];
+    }
+
     [self addToMapView:mapView belowLayer:nil];
 }