diff --git a/apps/user/app/auth/email/register-form.tsx b/apps/user/app/auth/email/register-form.tsx
index 821d6c6..32b29c0 100644
--- a/apps/user/app/auth/email/register-form.tsx
+++ b/apps/user/app/auth/email/register-form.tsx
@@ -53,7 +53,7 @@ export default function RegisterForm({
       password: z.string(),
       repeat_password: z.string(),
       code: auth.email.email_enable_verify ? z.string() : z.string().nullish(),
-      invite: invite.forced_invite ? z.string() : z.string().nullish(),
+      invite: invite.forced_invite ? z.string().min(1) : z.string().nullish(),
       cf_token:
         verify.enable_register_verify && verify.turnstile_site_key
           ? z.string()
diff --git a/apps/user/app/auth/phone/register-form.tsx b/apps/user/app/auth/phone/register-form.tsx
index d9995fa..1095d34 100644
--- a/apps/user/app/auth/phone/register-form.tsx
+++ b/apps/user/app/auth/phone/register-form.tsx
@@ -37,7 +37,7 @@ export default function RegisterForm({
       password: z.string(),
       repeat_password: z.string(),
       code: z.string(),
-      invite: invite.forced_invite ? z.string() : z.string().nullish(),
+      invite: invite.forced_invite ? z.string().min(1) : z.string().nullish(),
       cf_token:
         verify.enable_register_verify && verify.turnstile_site_key
           ? z.string()