fix error bug

src/components/ShipmentManagementModal.tsx

@@ -87,8 +87,10 @@ export const ShipmentManagementModal = ({
                             placeholder="انتخاب روش ارسال"
                             value={selectedShipment}
                             onChange={(e: React.ChangeEvent<HTMLSelectElement>) => setSelectedShipment(e.target.value)}
-                            items={availableShipments.map((shipment: Shipper) => ({
+                            items={availableShipments
-                                value: shipment._id.toString(),
+                                .filter((shipment: Shipper) => shipment._id != null)
+                                .map((shipment: Shipper) => ({
+                                    value: String(shipment._id),
                                     label: shipment.name
                                 }))}
                         />
@@ -109,7 +111,9 @@ export const ShipmentManagementModal = ({
                         <p className="text-gray-500 text-center py-8">هیچ روش ارسالی فعالی وجود ندارد</p>
                     ) : (
                         <div className="space-y-3">
-                            {adminShipments.map((shipment: ShipmentMethod) => (
+                            {adminShipments
+                                .filter((shipment: ShipmentMethod) => shipment._id != null)
+                                .map((shipment: ShipmentMethod) => (
                                 <div key={shipment._id} className="flex items-center justify-between p-4 bg-gray-50 rounded-xl">
                                     <div>
                                         <h4 className="font-medium">{shipment.name}</h4>
@@ -123,7 +127,7 @@ export const ShipmentManagementModal = ({
                                         variant="danger"
                                         size="sm"
                                         label="حذف"
-                                        onClick={() => handleRemoveShipmentFromAdmin(shipment._id.toString())}
+                                        onClick={() => handleRemoveShipmentFromAdmin(String(shipment._id))}
                                         isLoading={removeShipmentFromAdminMutation.isPending}
                                         className="w-fit"
                                     />