Cannot read properties of undefined (reading 'block') Exception

[msert29]

I'm trying to deploy to cloudflare worker and after cloning and building the repository with the updated attributes, I get the following exception raised whilst trying to access the page;

{
  "outcome": "exception",
  "scriptName": "notion-cloudflare-worker",
  "exceptions": [
    {
      "name": "TypeError",
      "message": "Cannot read properties of undefined (reading 'block')",
      "timestamp": 1678203099458
    }
  ],
  "logs": [],
  "eventTimestamp": 1678203099274,
  "event": {
    "request": {
      "url": "https://notion-cloudflare-worker.XYZ.workers.dev/v1/page/REDACTED",
      "method": "GET",
      "headers": {
        "accept": "application/json, text/plain, */*",
        "accept-encoding": "gzip",
        "authorization": "REDACTED",
        "cf-connecting-ip": "86.8.247.150",
        "cf-ipcountry": "GB",
        "cf-ray": "7a43e2fa683c3867",
        "cf-visitor": "{\"scheme\":\"https\"}",
        "connection": "Keep-Alive",
        "host": "notion-cloudflare-worker.XYZ.workers.dev",
        "user-agent": "axios/0.21.1",
        "x-forwarded-proto": "https",
      },
      "cf": {
        "clientTcpRtt": 16,
        "longitude": "-2.55310",
        "latitude": "51.47710",
        "tlsCipher": "AEAD-AES128-GCM-SHA256",
        "continent": "EU",
        "asn": 5089,
        "country": "GB",
        "tlsClientAuth": {
          "certIssuerDNLegacy": "",
          "certIssuerSKI": "",
          "certSubjectDNRFC2253": "",
          "certSubjectDNLegacy": "",
          "certFingerprintSHA256": "",
          "certNotBefore": "",
          "certSKI": "",
          "certSerial": "",
          "certIssuerDN": "",
          "certVerified": "NONE",
          "certNotAfter": "",
          "certSubjectDN": "",
          "certPresented": "0",
          "certRevoked": "0",
          "certIssuerSerial": "",
          "certIssuerDNRFC2253": "",
          "certFingerprintSHA1": ""
        },
        "tlsVersion": "TLSv1.3",
        "colo": "LHR",
        "timezone": "Europe/London",
        "city": "Bristol",
        "edgeRequestKeepAliveStatus": 1,
        "requestPriority": "",
        "httpProtocol": "HTTP/1.1",
        "region": "England",
        "regionCode": "ENG",
        "asOrganization": "Virgin Media",
        "postalCode": "REDACTED"
      }
    },
    "response": {
      "status": 500
    }
  },
  "id": 12
}