From ce368457236cdf35ac152e078e88907fa990a0f4 Mon Sep 17 00:00:00 2001
From: Vladimir Sheremet <sleuths.slews0s@icloud.com>
Date: Wed, 24 Apr 2024 13:39:05 +0200
Subject: [PATCH] fix: check for null before storing in weakmap

---
 packages/expect/src/jest-utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/expect/src/jest-utils.ts b/packages/expect/src/jest-utils.ts
index 7fe4cc706534..3358ca39bed1 100644
--- a/packages/expect/src/jest-utils.ts
+++ b/packages/expect/src/jest-utils.ts
@@ -452,7 +452,7 @@ export function subsetEquality(object: unknown, subset: unknown, customTesters:
           return undefined
 
         return Object.keys(subset).every((key) => {
-          if (typeof subset[key] === 'object') {
+          if (subset[key] != null && typeof subset[key] === 'object') {
             if (seenReferences.has(subset[key]))
               return equals(object[key], subset[key], filteredCustomTesters)