Trpc array of strings validation

next-dev.js?a272:20 TRPCClientError: 
Invalid `prisma.customer.create()` invocation:

{
  data: {
    User: {
      connect: {
        id: 'cl9ad533y0593r2mtqwouafdc'
      }
    },
    companyId: 'cl9q65gs72758jemtvo3vz8ay',
    Companies: {
      connect: {
        id: 'cl9q65gs72758jemtvo3vz8ay'
      }
    },
    salutation: 'Herr',
    firstname: 'Jürgen',
    lastname: 'Bauch',
    street_address: 'Landstraße 2',
    address_supplement: '',
    postal_code: '1231312',
    city: 'Berlin',
    country: 'DE',
    email: 'jbauch@gmail.com',
    email_type: 'Private',
    phone_number: '',
    phone_number_type: undefined,
    note: undefined,
    total_discount: undefined,
    terms_of_payment: '',
    delivery_terms: '',
    customer_number: '6c055cec-2161-4202-aa47-d49aba28f780',
    tags: [
      'Tech',
      'IT',
      'Land'
    ]
    ~~~~~~~~~
  }
}

Argument tags: Got invalid value 
[
  'Tech',
  'IT',
  'Land'
]
on prisma.createOneCustomer. Provided List<String>, expected String or Null.

const clientSchema = z
  .object({
    ... 
    tags: z.array(z.string()).nullish(),
  })