From 3e4734283e5bb4115fdca44dc1477902b2f9850e Mon Sep 17 00:00:00 2001
From: Anthony Fang <anthony@halopowered.com>
Date: Tue, 18 Aug 2020 00:04:04 -0400
Subject: [PATCH] fix: add null check for element

---
 ie11CustomProperties.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ie11CustomProperties.js b/ie11CustomProperties.js
index d703ffc..bfa99f8 100644
--- a/ie11CustomProperties.js
+++ b/ie11CustomProperties.js
@@ -544,7 +544,7 @@
 				if (inheritingKeywords[value] || !register[property] || register[property].inherits) {
 					//let el = this.pseudoElt ? this.computedFor : this.computedFor.parentNode;
 					let el = this.computedFor.parentNode;
-					while (el.nodeType === 1) {
+					while (el && el.nodeType === 1) {
 						// without, it affects performance: 1000 els inside 100 parents: 1000ms (instead of 600ms) is it acceptable?
 						// would also remove complexity, because i can remove the ieCP_setters property
 						//if (el.ieCP_setters && el.ieCP_setters[property]) {