diff --git a/AsyncDisplayKit/ASCollectionView.mm b/AsyncDisplayKit/ASCollectionView.mm
index 3dff9423af..8fba37b7b8 100644
--- a/AsyncDisplayKit/ASCollectionView.mm
+++ b/AsyncDisplayKit/ASCollectionView.mm
@@ -743,16 +743,19 @@ static BOOL _isInterceptedSelector(SEL sel)
 
 - (ASSizeRange)dataController:(ASCollectionDataController *)dataController constrainedSizeForSupplementaryNodeOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
 {
+  ASDisplayNodeAssert(_layoutDelegate != nil, @"ASCollectionView must have a layoutDelegate for layout inspection");
   return [_layoutDelegate collectionView:self constrainedSizeForSupplementaryNodeOfKind:kind atIndexPath:indexPath];
 }
 
 - (NSUInteger)dataController:(ASCollectionDataController *)dataController supplementaryViewsOfKind:(NSString *)kind inSection:(NSUInteger)section
 {
+  ASDisplayNodeAssert(_layoutDelegate != nil, @"ASCollectionView must have a layoutDelegate for layout inspection");
   return [_layoutDelegate collectionView:self supplementaryViewsOfKind:kind inSection:section];
 }
 
 - (NSUInteger)dataController:(ASCollectionDataController *)dataController numberOfSectionsForSupplementaryKind:(NSString *)kind;
 {
+  ASDisplayNodeAssert(_layoutDelegate != nil, @"ASCollectionView must have a layoutDelegate for layout inspection");
   return [_layoutDelegate collectionView:self numberOfSectionsForSupplementaryKind:kind];
 }