diff --git a/src/components/blog/index.jsx b/src/components/blog/index.jsx
index a655cdc..d71001d 100644
--- a/src/components/blog/index.jsx
+++ b/src/components/blog/index.jsx
@@ -121,7 +121,8 @@ const Blog = ({ loading, blog, googleAnalytics }) => {
               console.error(error);
             }
 
-            window.open(article.link, '_blank');
+            typeof window !== 'undefined' &&
+              window.open(article.link, '_blank');
           }}
         >
           <div className="p-8 h-full w-full">
diff --git a/src/components/project/index.jsx b/src/components/project/index.jsx
index 3f9397d..30641d4 100644
--- a/src/components/project/index.jsx
+++ b/src/components/project/index.jsx
@@ -72,7 +72,7 @@ const Project = ({ repo, loading, github, googleAnalytics }) => {
             console.error(error);
           }
 
-          window.open(item.html_url, '_blank');
+          typeof window !== 'undefined' && window.open(item.html_url, '_blank');
         }}
       >
         <div className="flex justify-between flex-col p-8 h-full w-full">
diff --git a/src/helpers/utils.jsx b/src/helpers/utils.jsx
index 3d53a06..79dc21a 100644
--- a/src/helpers/utils.jsx
+++ b/src/helpers/utils.jsx
@@ -17,7 +17,8 @@ export const getInitialTheme = (themeConfig) => {
   }
 
   if (themeConfig.respectPrefersColorScheme && !themeConfig.disableSwitch) {
-    return window.matchMedia('(prefers-color-scheme: dark)').matches
+    return typeof window !== 'undefined' &&
+      window.matchMedia('(prefers-color-scheme: dark)').matches
       ? 'dark'
       : themeConfig.defaultTheme;
   }
@@ -57,8 +58,10 @@ export const ga = {
   // initialize google analytic
   initialize: (id) => {
     try {
-      window.gtag('js', new Date());
-      window.gtag('config', id);
+      if (typeof window !== 'undefined') {
+        window.gtag('js', new Date());
+        window.gtag('config', id);
+      }
     } catch (error) {
       console.error(error);
     }
@@ -66,7 +69,7 @@ export const ga = {
   // log specific events happening
   event: ({ action, params }) => {
     try {
-      window.gtag('event', action, params);
+      typeof window !== 'undefined' && window.gtag('event', action, params);
     } catch (error) {
       console.error(error);
     }