fix app crash

frontend/src/components/Navbar/index.tsx

@@ -29,13 +29,13 @@ export function Navbar() {
                 ) : null}
             </Group>
             {!user?.logged ? (
-                <NavLink
+                <a
+                    href={`${Config.backend_uri}/auth/login`}
                     className={"navLink"}
                     aria-label={t("login with keycloak", { capfirst: true })}
-                    to={`${Config.backend_uri}/auth/login`}
                 >
                     {t("login with keycloak", { capfirst: true })}
-                </NavLink>
+                </a>
             ) : (
                 <a
                     href={`${Config.backend_uri}/auth/logout`}

frontend/src/components/Products/Modal/index.tsx

@@ -36,7 +36,7 @@ export function ProductModal({ opened, onClose, currentProduct, handleSubmit }:
             quantity: currentProduct?.quantity ?? null,
             quantity_unit: currentProduct?.quantity_unit ?? null,
             type: currentProduct?.type ?? null,
-            productor_id: currentProduct ? String(currentProduct.productor.id) : null,
+            productor_id: currentProduct ? String(currentProduct?.productor?.id) : null,
         },
         validate: {
             name: (value) =>