From 05744e33ea844981745cec9556c30c1738e64776 Mon Sep 17 00:00:00 2001
From: Steve Carlson <yasteve@verizonmedia.com>
Date: Tue, 31 Mar 2020 14:06:49 -0700
Subject: [PATCH] Bail out when null values are encountered

---
 src/atomizer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/atomizer.js b/src/atomizer.js
index 49ebe162..034fbf2c 100644
--- a/src/atomizer.js
+++ b/src/atomizer.js
@@ -361,7 +361,7 @@ Atomizer.prototype.parseConfig = function (config/*:AtomizerConfig*/, options/*:
                             treeo.declarations.filter = 'alpha(opacity=' + parseFloat(value, 10) * 100 + ')';
                         }
                     }
-                    if (value !== null) {
+                    if (value !== null && treeo.declarations) {
                         // value could be an object for custom classes with breakPoints
                         // e.g.
                         // 'custom': {