diff --git a/frontend/src/core/config/index.ts b/frontend/src/core/config/index.ts
index 07f355c..88c2e5d 100644
--- a/frontend/src/core/config/index.ts
+++ b/frontend/src/core/config/index.ts
@@ -1,10 +1,18 @@
 import { env } from "@/env";
 
+function getBaseOrigin() {
+  if (typeof window !== "undefined") {
+    return window.location.origin;
+  }
+
+  return undefined;
+}
+
 export function getBackendBaseURL() {
   if (env.NEXT_PUBLIC_BACKEND_BASE_URL) {
     return new URL(
       env.NEXT_PUBLIC_BACKEND_BASE_URL,
-      window.location.origin,
+      getBaseOrigin(),
     ).toString();
   } else {
     return "";
@@ -15,7 +23,7 @@ export function getLangGraphBaseURL(isMock?: boolean) {
   if (env.NEXT_PUBLIC_LANGGRAPH_BASE_URL) {
     return new URL(
       env.NEXT_PUBLIC_LANGGRAPH_BASE_URL,
-      window.location.origin,
+      getBaseOrigin(),
     ).toString();
   } else if (isMock) {
     if (typeof window !== "undefined") {