diff --git a/lib/properties/fontFamily.js b/lib/properties/fontFamily.js
index e2c6ed4d..20b6a5cd 100644
--- a/lib/properties/fontFamily.js
+++ b/lib/properties/fontFamily.js
@@ -45,6 +45,9 @@ function parse(v) {
   });
   const parsedValues = [];
   for (const val of values) {
+    if (!val) {
+      return "";
+    }
     const value = parsers.parsePropertyValue(property, val, {
       caseSensitive: true
     });