1 files changed, 6 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLVectorSource.mm b/platform/darwin/src/MGLVectorSource.mm
index ae69456b45..ab68d45ba1 100644
--- a/platform/darwin/src/MGLVectorSource.mm
+++ b/platform/darwin/src/MGLVectorSource.mm
@@ -59,6 +59,12 @@
 
 - (void)addToMapView:(MGLMapView *)mapView
 {
+    if (_pendingSource == nullptr) {
+        [NSException raise:@"MGLRedundantSourceException"
+                    format:@"This instance %@ was already added to %@. Adding the same source instance " \
+                            "to the style more than once is invalid.", self, mapView.style];
+    }
+
     mapView.mbglMap->addSource(std::move(_pendingSource));
 }