diff --git a/index.js b/index.js
index 2b3277f..59d68a3 100644
--- a/index.js
+++ b/index.js
@@ -79,7 +79,7 @@ const classes = ${classNames};
 const css = \`${result.css}\`;
 ${options.inject && `
 (function() {
-  if (!document.getElementById(digest)) {
+  if (typeof document !== "undefined" && !document.getElementById(digest)) {
     var ele = document.createElement('style');
     ele.id = digest;
     ele.textContent = css;