1 files changed, 15 insertions, 6 deletions
diff --git a/platform/macos/src/MGLMapView.mm b/platform/macos/src/MGLMapView.mm
index 5d14192c61..68a21b5666 100644
--- a/platform/macos/src/MGLMapView.mm
+++ b/platform/macos/src/MGLMapView.mm
@@ -1806,12 +1806,18 @@ public:
 
         for (auto const& annotationTag: annotationTags)
         {
-            if (!_annotationContextsByAnnotationTag.count(annotationTag))
+            if (!_annotationContextsByAnnotationTag.count(annotationTag) ||
+                annotationTag == MGLAnnotationTagNotFound)
             {
                 continue;
             }
+
             MGLAnnotationContext annotationContext = _annotationContextsByAnnotationTag.at(annotationTag);
-            [annotations addObject:annotationContext.annotation];
+            NSAssert(annotationContext.annotation, @"Missing annotation for tag %u.", annotationTag);
+            if (annotationContext.annotation)
+            {
+                [annotations addObject:annotationContext.annotation];
+            }
         }
 
         return [annotations copy];
@@ -1822,11 +1828,12 @@ public:
 
 /// Returns the annotation assigned the given tag. Cheap.
 - (id <MGLAnnotation>)annotationWithTag:(MGLAnnotationTag)tag {
-    if (!_annotationContextsByAnnotationTag.count(tag)) {
+    if ( ! _annotationContextsByAnnotationTag.count(tag) ||
+        tag == MGLAnnotationTagNotFound) {
         return nil;
     }
 
-    MGLAnnotationContext &annotationContext = _annotationContextsByAnnotationTag[tag];
+    MGLAnnotationContext &annotationContext = _annotationContextsByAnnotationTag.at(tag);
     return annotationContext.annotation;
 }
 
@@ -2063,8 +2070,8 @@ public:
         // Filter out any annotation whose image is unselectable or for which
         // hit testing fails.
         auto end = std::remove_if(nearbyAnnotations.begin(), nearbyAnnotations.end(), [&](const MGLAnnotationTag annotationTag) {
-            NSAssert(_annotationContextsByAnnotationTag.count(annotationTag) != 0, @"Unknown annotation found nearby click");
             id <MGLAnnotation> annotation = [self annotationWithTag:annotationTag];
+            NSAssert(annotation, @"Unknown annotation found nearby click");
             if (!annotation) {
                 return true;
             }
@@ -2153,9 +2160,11 @@ public:
 }
 
 - (id <MGLAnnotation>)selectedAnnotation {
-    if (!_annotationContextsByAnnotationTag.count(_selectedAnnotationTag)) {
+    if ( ! _annotationContextsByAnnotationTag.count(_selectedAnnotationTag) ||
+        _selectedAnnotationTag == MGLAnnotationTagNotFound) {
         return nil;
     }
+    
     MGLAnnotationContext &annotationContext = _annotationContextsByAnnotationTag.at(_selectedAnnotationTag);
     return annotationContext.annotation;
 }