From 030114bda256aa4b419577607a848156e1d6cee8 Mon Sep 17 00:00:00 2001
From: Enrique Piqueras <epiqueras@users.noreply.github.com>
Date: Mon, 10 Feb 2020 11:48:23 -0500
Subject: [PATCH] Project Management Automation: Guard against non-matching
 commits in `addMilestone`.

Fixes #20144.
---
 packages/project-management-automation/lib/add-milestone.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/project-management-automation/lib/add-milestone.js b/packages/project-management-automation/lib/add-milestone.js
index 85e5784bff77a4..e7dc6cef3c4b6f 100644
--- a/packages/project-management-automation/lib/add-milestone.js
+++ b/packages/project-management-automation/lib/add-milestone.js
@@ -41,7 +41,8 @@ async function addMilestone( payload, octokit ) {
 		return;
 	}
 
-	const [ , prNumber ] = payload.commits[ 0 ].message.match( /\(#(\d+)\)$/m );
+	const match = payload.commits[ 0 ].message.match( /\(#(\d+)\)$/m );
+	const prNumber = match && match[ 1 ];
 	if ( ! prNumber ) {
 		debug( 'add-milestone: Commit is not a squashed PR. Aborting' );
 		return;