Query Error: Fetching Checkbox Values with GraphQL API

Hi,

I have been successfully using the following GraphQL query to fetch records where the checkbox value is ‘true’, but it suddenly stopped working today. Here’s the request API body:

query {
  boards (ids: 1924842771) {
    items_page (limit: 2, query_params: {
      rules: [
        {column_id: "checkbox", compare_value: [null], operator: is_not_empty}
      ]
    }) {
      items {
        id
        name
      }
    }
  }
}

However, now I am getting the following error:

{
  "errors": [
    {
      "message": "CompareValue cannot represent value: null",
      "locations": [
        {
          "line": 5,
          "column": 48
        }
      ],
      "extensions": {
        "code": "GRAPHQL_VALIDATION_FAILED"
      }
    }
  ],
  "account_id": 25960244
}

This query was working until yesterday, and nothing was changed on my end. Has there been any recent update to the Monday.com API, or is there something I need to modify in my query to resolve this issue?

Thank you for your help!

**Regards, **
Hardik P