From eb6bfc07000ba5f521edaaab30cdd35a40e28a07 Mon Sep 17 00:00:00 2001
From: Diego Sampaio <chinello@gmail.com>
Date: Fri, 22 Jun 2018 09:11:29 -0300
Subject: [PATCH] Skip operations if no action on livechat migration

Closes #11231
---
 server/startup/migrations/v123.js | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/server/startup/migrations/v123.js b/server/startup/migrations/v123.js
index e1e0b7b4fe1e3..eb866ee369111 100644
--- a/server/startup/migrations/v123.js
+++ b/server/startup/migrations/v123.js
@@ -51,10 +51,17 @@ async function migrateHistory(total, current) {
 		return result;
 	}, { insert: [], remove: [] });
 
-	const batch = Promise.all([
-		messageCollection.insertMany(actions.insert),
-		pageVisitedCollection.removeMany({ _id: { $in: actions.remove } })
-	]);
+	const ops = [];
+
+	if (actions.insert.length > 0) {
+		ops.push(messageCollection.insertMany(actions.insert));
+	}
+
+	if (actions.remove.length > 0) {
+		ops.push(pageVisitedCollection.removeMany({ _id: { $in: actions.remove } }));
+	}
+
+	const batch = Promise.all(ops);
 	if (actions.remove.length === batchSize) {
 		await batch;
 		return migrateHistory(total, current + batchSize);