Index: src/wp-admin/includes/class-wp-users-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-users-list-table.php	(revision 40566)
+++ src/wp-admin/includes/class-wp-users-list-table.php	(working copy)
@@ -372,11 +372,11 @@
 	 * @since 4.4.0 The `$role` parameter was deprecated.
 	 * @access public
 	 *
-	 * @param object $user_object The current user object.
-	 * @param string $style       Deprecated. Not used.
-	 * @param string $role        Deprecated. Not used.
-	 * @param int    $numposts    Optional. Post count to display for this user. Defaults
-	 *                            to zero, as in, a new user has made zero posts.
+	 * @param WP_User $user_object The current user object.
+	 * @param string  $style       Deprecated. Not used.
+	 * @param string  $role        Deprecated. Not used.
+	 * @param int     $numposts    Optional. Post count to display for this user. Defaults
+	 *                             to zero, as in, a new user has made zero posts.
 	 * @return string Output for a single row.
 	 */
 	public function single_row( $user_object, $style = '', $role = '', $numposts = 0 ) {
@@ -470,7 +470,11 @@
 						$r .= "$avatar $edit";
 						break;
 					case 'name':
-						$r .= "$user_object->first_name $user_object->last_name";
+					  if ( ! empty( $user_object->first_name ) || ! empty( $user_object->last_name ) ) {
+							$r .= "$user_object->first_name $user_object->last_name";
+						} else {
+							$r .= "—";
+						}
 						break;
 					case 'email':
 						$r .= "<a href='" . esc_url( "mailto:$email" ) . "'>$email</a>";