From aa7b529be017ec5c7f158d6bf0ed1b8e736d1343 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Tue, 16 Feb 2021 12:24:29 -0500
Subject: [PATCH] fix(populate): set not found values to `null` for paths that
 are not in the schema

Fix #9913
---
 lib/helpers/populate/assignVals.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/helpers/populate/assignVals.js b/lib/helpers/populate/assignVals.js
index 9fd51d80967..a09b1007473 100644
--- a/lib/helpers/populate/assignVals.js
+++ b/lib/helpers/populate/assignVals.js
@@ -240,7 +240,7 @@ function valueFilter(val, assignmentOpts, populateOptions) {
   if (populateOptions.justOne === false) {
     return [];
   }
-  return val;
+  return val == null ? val : null;
 }
 
 /*!