Nexus objectType error

gistfile1.txt

// schema

model Company {
  id            Int      @id @default(autoincrement())
  name          String
  trades        Trade[]
}

model Trade {
  id        Int     @id @default(autoincrement())
  name      String
  company   Company @relation(fields: [companyId], references: [id]) 
  companyId Int
}

// nexus
export const Company = objectType({
    name: 'Company',
    definition(t) {
        t.nonNull.int('id')
        t.nonNull.string('name')
        t.nonNull.list.nonNull.field('trades', {
            type: 'Trade',
            resolve: (parent, _, ctx) => {
                return ctx.db.company.findUnique({
                    where: {id: parent.id}
                }).trades()
            }
        });
    }
})

export const Trade = objectType({
    name: 'Trade',
    definition(t) {
        t.nonNull.int('id')
        t.nonNull.string('name')
        t.nonNull.field('company', {
            type: 'Company',
            resolve: (parent, _, ctx) => { // <----------------error on resolve
                return ctx.db.trade.findUnique({
                    where: {id: parent.id}
                }).company()
            }
        })
    }
})

// Error: Type 'Company | null' is not assignable to type .....
// So this must have something to do with me stating its nonNull right? but according to the nexus docs it should be nonNull