From 710954ee96389e4f81627e3eeaf28abfec1eed64 Mon Sep 17 00:00:00 2001
From: Evilebot Tnawi <evilebottnawi@users.noreply.github.com>
Date: Wed, 29 May 2019 17:37:10 +0300
Subject: [PATCH] fix: handle cases when properties `undefined` in
 `replaceSymbols` (#62)

---
 .travis.yml           | 4 ++--
 src/replaceSymbols.js | 5 +++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index d9389a5..fd6eb9c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@ cache:
 
 matrix:
   include:
-    - node_js: "11"
+    - node_js: "12"
       env: JOB_PART=pretest
     - node_js: "6"
       env: JOB_PART=test
@@ -25,7 +25,7 @@ matrix:
       env: JOB_PART=test
     - node_js: "10"
       env: JOB_PART=test
-    - node_js: "11"
+    - node_js: "12"
       env: JOB_PART=test
 
 before_script:
diff --git a/src/replaceSymbols.js b/src/replaceSymbols.js
index dc29308..9e53448 100644
--- a/src/replaceSymbols.js
+++ b/src/replaceSymbols.js
@@ -2,12 +2,13 @@ import replaceValueSymbols from "./replaceValueSymbols.js";
 
 const replaceSymbols = (css, replacements) => {
   css.walk(node => {
-    if (node.type === "decl") {
+    if (node.type === "decl" && node.value) {
       node.value = replaceValueSymbols(node.value, replacements);
-    } else if (node.type === "rule") {
+    } else if (node.type === "rule" && node.selector) {
       node.selector = replaceValueSymbols(node.selector, replacements);
     } else if (
       node.type === "atrule" &&
+      node.params &&
       ["media", "supports"].includes(node.name.toLowerCase())
     ) {
       node.params = replaceValueSymbols(node.params, replacements);