Nullable Datetime Field

hello i'm trying to create a field

last_purchase_date

last_purchase_date

last_purchase_date

last_purchase_date but there's a case where user has not purchased yet so i want the field to be null.

this is what i have in schema.prisma

model Item {
  last_purchase_date DateTime?
}

model Item {
  last_purchase_date DateTime?
}

model Item {
  last_purchase_date DateTime?
}

model Item {
  last_purchase_date DateTime?
}

and this seems to work, the field can be null, but when i try to query it with prisma i get this error.

Error converting field "last_purchase_date" of expected non-nullable type "DateTime", found incompatible value of "null"

Error converting field "last_purchase_date" of expected non-nullable type "DateTime", found incompatible value of "null"

Error converting field "last_purchase_date" of expected non-nullable type "DateTime", found incompatible value of "null"

Error converting field "last_purchase_date" of expected non-nullable type "DateTime", found incompatible value of "null"