diff --git a/ui/forms/register-center/InnerRegistrationCenterForm.tsx b/ui/forms/register-center/InnerRegistrationCenterForm.tsx
index e5e868d..5aa5fb4 100644
--- a/ui/forms/register-center/InnerRegistrationCenterForm.tsx
+++ b/ui/forms/register-center/InnerRegistrationCenterForm.tsx
@@ -31,7 +31,7 @@ export default function InnerRegistrationCenterForm(props: InnerFormProps) {
   const theme = useTheme();
   const isMobile = useMediaQuery(theme.breakpoints.down("md"));
   const handleBack = () => {
-    props.update({ registrationCenter: props.values.selectedCenter});
+    props.update({ registrationCenter: props.values});
     props.setStep((prev) => Math.max(1, prev - 1));
   };
 
diff --git a/ui/forms/register-center/RegistrationCenterForm.tsx b/ui/forms/register-center/RegistrationCenterForm.tsx
index f3640db..4e63c89 100644
--- a/ui/forms/register-center/RegistrationCenterForm.tsx
+++ b/ui/forms/register-center/RegistrationCenterForm.tsx
@@ -27,7 +27,7 @@ const EMPTY_VALUES: RegistrationCenterFormValues = {
 
 const RegistrationCenterFormValidationSchema = yup.object({
   selectedCenter: yup
-    .mixed<CenterItem | null>()
+    .mixed<CenterItem>()
     .nullable()
     .required("لطفاً یک مرکز را انتخاب کنید"),
 });