From 341beac0fb2c1c50fc4d3aa20f6a788d2b724a5a Mon Sep 17 00:00:00 2001
From: Raphael Reynaud <82550120+raphyluke@users.noreply.github.com>
Date: Fri, 29 Dec 2023 11:34:50 +0100
Subject: [PATCH] Ensure valueOf returns NaN for invalid instances (#1082)

Closes #1075
---
 moment-timezone.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/moment-timezone.js b/moment-timezone.js
index dd2f0213..6e568cd2 100644
--- a/moment-timezone.js
+++ b/moment-timezone.js
@@ -640,7 +640,7 @@
 			offset;
 
 		if (mom._z === undefined) {
-			if (zone && needsOffset(mom) && !mom._isUTC) {
+			if (zone && needsOffset(mom) && !mom._isUTC && mom.isValid()) {
 				mom._d = moment.utc(mom._a)._d;
 				mom.utc().add(zone.parse(mom), 'minutes');
 			}