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 2578f4b..81dd879 100644
--- a/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
+++ b/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
@@ -150,7 +150,7 @@ export function MixSignUp(props: {
 
           console.log("--regname:", regname, "--referrer:", refer)
           props.email(regname)
-          props.referrer(refer || "")
+          props.referrer(refer)
 
           setGoPassword(true)
         }}>