ConnectorError Some(WasNull()) on `String[]` field with `NULL` entries

Bug description

When running Prisma in production I occasionally get this error:

Error occurred during query execution:
ConnectorError(ConnectorError { user_facing_error: None, kind: QueryError(Error { kind: FromSql(6), cause: Some(WasNull) }) })

How to reproduce

I cannot reproduce this reliably, but can provide DM a Sentry error for diagnosis.

Expected behavior

No error should be thrown.

Prisma information

Prisma Query:

  const user = await prisma.user.findUnique({
    where: { id: data.userId },
    rejectOnNotFound: true,
  });

Relevant schema:

model User {
  id     Int     @id @default(autoincrement())
}

Environment & setup

• OS:
• Database:
• Node.js version:

Running on Heroku with PostgreSQL 13 against Node.js v16.13.1.

Prisma Version

prisma                  : 3.4.0
@prisma/client          : 3.4.0
Current platform        : debian-openssl-1.1.x
Query Engine (Node-API) : libquery-engine 1c9fdaa9e2319b814822d6dbfd0a69e1fcc13a85 (at node_modules/@prisma/engines/libquery_engine-debian-openssl-1.1.x.so.node)
Migration Engine        : migration-engine-cli 1c9fdaa9e2319b814822d6dbfd0a69e1fcc13a85 (at node_modules/@prisma/engines/migration-engine-debian-openssl-1.1.x)
Introspection Engine    : introspection-core 1c9fdaa9e2319b814822d6dbfd0a69e1fcc13a85 (at node_modules/@prisma/engines/introspection-engine-debian-openssl-1.1.x)
Format Binary           : prisma-fmt 1c9fdaa9e2319b814822d6dbfd0a69e1fcc13a85 (at node_modules/@prisma/engines/prisma-fmt-debian-openssl-1.1.x)
Default Engines Hash    : 1c9fdaa9e2319b814822d6dbfd0a69e1fcc13a85
Studio                  : 0.438.0

[pantharshit00]

Thanks for the concise reproduction @westmark. I was able to reproduce the error.

[Weakky]

Hey,

Given the clear error message we now have, is it acceptable to close this?

To be clear, Prisma unfortunately doesn’t support nullable scalar lists at the moment but we already have a feature request here.