diff --git a/blocks/medium-promo-block/features/medium-promo/default.jsx b/blocks/medium-promo-block/features/medium-promo/default.jsx
index daa78ec9ed..aef61ddd16 100644
--- a/blocks/medium-promo-block/features/medium-promo/default.jsx
+++ b/blocks/medium-promo-block/features/medium-promo/default.jsx
@@ -159,7 +159,7 @@ const MediumPromo = ({ customFields }) => {
 		return null;
 	}
 
-	const hasAuthors = showByline ? content?.credits?.by && content?.credits?.by.length : null;
+	const hasAuthors = showByline ? content?.credits?.by && content?.credits?.by?.length : null;
 	const contentDescription = showDescription ? content?.description?.basic : null;
 	const contentHeading = showHeadline ? content?.headlines?.basic : null;
 	const contentUrl = content?.websites?.[arcSite]?.website_url;
diff --git a/blocks/top-table-list-block/features/top-table-list/_children/extra-large.jsx b/blocks/top-table-list-block/features/top-table-list/_children/extra-large.jsx
index c45a5651b2..ec116ae704 100644
--- a/blocks/top-table-list-block/features/top-table-list/_children/extra-large.jsx
+++ b/blocks/top-table-list-block/features/top-table-list/_children/extra-large.jsx
@@ -85,7 +85,7 @@ const ExtraLarge = (props) => {
 	const contentHeading = showHeadlineXL ? element?.headlines?.basic : null;
 	const contentUrl = element?.websites?.[arcSite]?.website_url;
 	const embedMarkup = playVideoInPlaceXL && getVideoFromANS(element);
-	const hasAuthors = showBylineXL && element?.credits?.by.length > 0;
+	const hasAuthors = showBylineXL && element?.credits?.by?.length > 0;
 	const ansImage = getImageFromANS(element);
 	const imageParams =
 		element && ansImage
diff --git a/blocks/top-table-list-block/features/top-table-list/_children/medium.jsx b/blocks/top-table-list-block/features/top-table-list/_children/medium.jsx
index 8af253a0a3..11499ccd45 100644
--- a/blocks/top-table-list-block/features/top-table-list/_children/medium.jsx
+++ b/blocks/top-table-list-block/features/top-table-list/_children/medium.jsx
@@ -54,7 +54,7 @@ const Medium = (props) => {
 
 	const showBottomBorder = typeof showBottomBorderMD === "undefined" ? true : showBottomBorderMD;
 
-	const hasAuthors = showBylineMD ? element?.credits?.by && element?.credits?.by.length : null;
+	const hasAuthors = showBylineMD ? element?.credits?.by && element?.credits?.by?.length : null;
 	const contentDescription = showDescriptionMD ? element?.description?.basic : null;
 	const contentHeading = showHeadlineMD ? element?.headlines?.basic : null;
 	const contentUrl = element?.websites?.[arcSite]?.website_url;