diff --git a/wp-includes/class-wp-list-util.php b/wp-includes/class-wp-list-util.php
index 3648cd89f5..c394f2c613 100644
--- a/wp-includes/class-wp-list-util.php
+++ b/wp-includes/class-wp-list-util.php
@@ -166,8 +166,14 @@ class WP_List_Util {
 			foreach ( $this->output as $key => $value ) {
 				if ( is_object( $value ) ) {
 					$newlist[ $key ] = $value->$field;
-				} else {
+				} elseif ( is_array( $value ) ) {
 					$newlist[ $key ] = $value[ $field ];
+				} else {
+					_doing_it_wrong(
+						__METHOD__,
+						__( 'Values for the input array must be either objects or arrays.' ),
+						'6.2.0'
+					);
 				}
 			}
 
@@ -187,12 +193,18 @@ class WP_List_Util {
 				} else {
 					$newlist[] = $value->$field;
 				}
-			} else {
+			} elseif ( is_array( $value ) ) {
 				if ( isset( $value[ $index_key ] ) ) {
 					$newlist[ $value[ $index_key ] ] = $value[ $field ];
 				} else {
 					$newlist[] = $value[ $field ];
 				}
+			} else {
+				_doing_it_wrong(
+					__METHOD__,
+					__( 'Values for the input array must be either objects or arrays.' ),
+					'6.2.0'
+				);
 			}
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0301dd9bfc..e0dfc0e382 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-beta3-55422';
+$wp_version = '6.2-beta3-55423';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.