Index: wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php
===================================================================
--- wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php	(revision 49687)
+++ wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php	(working copy)
@@ -114,7 +114,11 @@
 			 * @param array $sitemap_entry Sitemap entry for the home page.
 			 */
 			$sitemap_entry = apply_filters( 'wp_sitemaps_posts_show_on_front_entry', $sitemap_entry );
-			$url_list[]    = $sitemap_entry;
+			
+			if ( ! empty( $sitemap_entry ) {
+		
+				$url_list[] = $sitemap_entry;
+			}
 		}
 
 		foreach ( $query->posts as $post ) {
@@ -132,7 +136,11 @@
 			 * @param string  $post_type     Name of the post_type.
 			 */
 			$sitemap_entry = apply_filters( 'wp_sitemaps_posts_entry', $sitemap_entry, $post, $post_type );
-			$url_list[]    = $sitemap_entry;
+
+			if ( ! empty( $sitemap_entry ) {
+
+				$url_list[] = $sitemap_entry;
+			}
 		}
 
 		return $url_list;