Save foreign key prisma + trpc

            const client = await prisma?.customer.create({
                data: {
                    companyId: company?.id,
                    userId: userId,

      Types of property 'userId' are incompatible.
        Type 'string | undefined' is not assignable to type 'undefined'.
          Type 'string' is not assignable to type 'undefined'.ts(2322)

model Customer {
  id                 String       @id @default(cuid())
  userId             String
  companyId          String?      @unique
  createdAt          DateTime     @default(now())
  updatedAt          DateTime     @updatedAt
  user               User         @relation(fields: [userId], references: [id], onDelete: Cascade)
  Company            Company[]
}