diff --git a/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx b/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
index fab1cf1..91fab73 100644
--- a/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
+++ b/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
@@ -35,7 +35,7 @@ export function MixSignUp(props: {
 
   const router = useRouter();
   const { t } = useTranslation();
-  
+
   React.useEffect(() => {
     const signUpFromParams = async () => {
       const ticket = new URL(window.location.href).searchParams.get("__clerk_ticket");
@@ -146,11 +146,11 @@ export function MixSignUp(props: {
             typeof regname !== "string"
           ) {
             return null;
-          }
+          }      
 
           console.log("--regname:", regname, "--referrer:", refer)
           props.email(regname)
-          props.referrer(refer)
+          props.referrer(refer || "")
 
           setGoPassword(true)
         }}>