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 81dd879..730743d 100644
--- a/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
+++ b/apps/blogai/app/[locale]/auth/sign-up/mix-signup.tsx
@@ -148,6 +148,13 @@ export function MixSignUp(props: {
             return null;
           }      
 
+          if (
+            typeof referreredit !== "string"
+          ) {
+            return null;
+          }      
+
+
           console.log("--regname:", regname, "--referrer:", refer)
           props.email(regname)
           props.referrer(refer)