diff --git a/wp-admin/options.php b/wp-admin/options.php
index 84ac775fd4..d63b10eb4f 100644
--- a/wp-admin/options.php
+++ b/wp-admin/options.php
@@ -255,7 +255,7 @@ if ( 'update' === $action ) { // We are saving settings sent from a settings pag
 		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 ( 'update' === $action ) { // We are saving settings sent from a settings pag
 		if ( $user_language_old !== $user_language_new ) {
 			load_default_textdomain( $user_language_new );
 		}
+	} else {
+		add_settings_error( 'general', 'settings_updated', __( 'Settings save failed.' ), 'error' );
 	}
 
 	/*
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 31663598ff..80a6a8c6e0 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-53150';
+$wp_version = '6.0-alpha-53151';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.