From 648e6e6d9f21eadd19ef7e2a600cc671ce39b032 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Fri, 28 Aug 2020 10:03:00 -0400
Subject: [PATCH] fix(model): avoid uncaught error if `insertMany()` fails due
 to server selection error

Fix #9355
---
 lib/model.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/model.js b/lib/model.js
index 4ce3e39e648..84b4220bd3d 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -3323,7 +3323,7 @@ Model.$__insertMany = function(arr, options, callback) {
         }
 
         // `insertedDocs` is a Mongoose-specific property
-        const erroredIndexes = new Set(error.writeErrors.map(err => err.index));
+        const erroredIndexes = new Set(get(error, 'writeErrors', []).map(err => err.index));
         error.insertedDocs = docAttributes.filter((doc, i) => {
           return !erroredIndexes.has(i);
         });