diff --git a/src/wp-admin/options.php b/src/wp-admin/options.php
index 84ac775fd43d8..d63b10eb4fd52 100644
--- a/src/wp-admin/options.php
+++ b/src/wp-admin/options.php
@@ -255,7 +255,7 @@
 		if ( is_multisite() && ! current_user_can( 'manage_network_options' ) ) {
 			wp_die( __( 'Sorry, you are not allowed to modify unregistered settings for this site.' ) );
 		}
-		$options = explode( ',', wp_unslash( $_POST['page_options'] ) );
+		$options = isset( $_POST['page_options'] ) ? explode( ',', wp_unslash( $_POST['page_options'] ) ) : null;
 	} else {
 		$options = $allowed_options[ $option_page ];
 	}
@@ -332,6 +332,8 @@
 		if ( $user_language_old !== $user_language_new ) {
 			load_default_textdomain( $user_language_new );
 		}
+	} else {
+		add_settings_error( 'general', 'settings_updated', __( 'Settings save failed.' ), 'error' );
 	}
 
 	/*