Action fails with "Cannot read properties of undefined (reading 'user')"

[tlevesque-ueat]

Sometimes the action fails with the following error:

Cannot read properties of undefined (reading 'user')

Here's the full log for the step with debug enabled:

##[debug]Evaluating condition for step: 'Compute pull request stats'
##[debug]Evaluating: success()
##[debug]Evaluating success:
##[debug]=> true
##[debug]Result: true
##[debug]Starting: Compute pull request stats
##[debug]Loading inputs
##[debug]Evaluating: github.token
##[debug]Evaluating Index:
##[debug]..Evaluating github:
##[debug]..=> Object
##[debug]..Evaluating String:
##[debug]..=> 'token'
##[debug]=> '***'
##[debug]Result: '***'
##[debug]Loading env
Run flowwer-dev/pull-request-stats@v3.2.2
  with:
    period: 14
    charts: true
    githubToken: ***
    limit: 0
    publishAs: COMMENT
    disableLinks: false
    telemetry: true
    disable-links: false
##[debug]Inputs: {
##[debug]  "currentRepo": "<redacted>",
##[debug]  "githubToken": "***",
##[debug]  "personalToken": "***",
##[debug]  "pullRequestId": "PR_kwDOJWZ0oc6sLAAe",
##[debug]  "org": "",
##[debug]  "repos": [
##[debug]    "<redacted>"
##[debug]  ],
##[debug]  "sortBy": "",
##[debug]  "mainStats": [
##[debug]    "totalReviews",
##[debug]    "timeToReview",
##[debug]    "totalComments"
##[debug]  ],
##[debug]  "publishAs": "COMMENT",
##[debug]  "periodLength": 14,
##[debug]  "displayCharts": true,
##[debug]  "disableLinks": false,
##[debug]  "limit": 0,
##[debug]  "excludeStr": "",
##[debug]  "includeStr": "",
##[debug]  "telemetry": true,
##[debug]        "deletions": 1,
##[debug]        "publishedAt": "2025-09-29T01:18:53.000Z",
##[debug]        "cursor": "Y3Vyc29yOjk=",
##[debug]        "id": "PR_kwDOJWZ0oc6q_P3A",
##[debug]        "lines": 2,
##[debug]        "reviews": []
##[debug]      },
##[debug]      {
##[debug]        "author": {},
##[debug]        "additions": 2,
##[debug]        "deletions": 2,
##[debug]        "publishedAt": "2025-09-29T00:15:42.000Z",
##[debug]        "cursor": "Y3Vyc29yOjEw",
##[debug]        "id": "PR_kwDOJWZ0oc6q-3tZ",
##[debug]        "lines": 4,
##[debug]        "reviews": []
##[debug]      },
##[debug]      {
##[debug]        "author": {},
##[debug]        "additions": 1,
##[debug]        "deletions": 1,
##[debug]        "publishedAt": "2025-09-29T01:18:48.000Z",
##[debug]        "cursor": "Y3Vyc29yOjEx",
##[debug]        "id": "PR_kwDOJWZ0oc6q_P1b",
##[debug]        "lines": 2,
##[debug]        "reviews": []
##[debug]      }
##[debug]    ],
##[debug]    "stats": {
##[debug]      "openedPullRequests": 11,
##[debug]      "totalObservations": 0,
##[debug]      "medianObservations": null,
##[debug]      "revisionSuccessRate": null,
##[debug]      "additions": 125,
##[debug]      "deletions": 125,
##[debug]      "lines": 250
##[debug]    }
##[debug]  }
##[debug]]
Analyzed stats for 0 reviewers
##[debug][]
##[debug]Analyzed entries: 0
##[debug]Table content built successfully
##[debug]Execution failed with error: Cannot read properties of undefined (reading 'user')
##[debug]TypeError: Cannot read properties of undefined (reading 'user')
##[debug]    at module.exports (/home/runner/work/_actions/flowwer-dev/pull-request-stats/v3.2.2/dist/index.js:42667:35)
##[debug]    at module.exports (/home/runner/work/_actions/flowwer-dev/pull-request-stats/v3.2.2/dist/index.js:42689:19)
##[debug]    at module.exports (/home/runner/work/_actions/flowwer-dev/pull-request-stats/v3.2.2/dist/index.js:44144:25)
##[debug]    at run (/home/runner/work/_actions/flowwer-dev/pull-request-stats/v3.2.2/dist/index.js:42168:9)
##[debug]    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
##[debug]    at async module.exports (/home/runner/work/_actions/flowwer-dev/pull-request-stats/v3.2.2/dist/index.js:42193:21)
##[debug]    at async run (/home/runner/work/_actions/flowwer-dev/pull-request-stats/v3.2.2/dist/index.js:49758:5)
Error: Cannot read properties of undefined (reading 'user')
##[debug]Node Action run completed with exit code 1
##[debug]Finishing: Compute pull request stats

As far as I can tell, it happens here:

pull-request-stats/src/interactors/buildMarkdown/getMarkdownContent.js

Line 66 in b1825f0

const firstUser = table.rows[0].user;

And I'm pretty sure it's related to the "Analyzed stats for 0 reviewers" in the logs.

This repo doesn't have much activity, but we have a tool (Mend Renovate) that frequently sends pull requests to keep dependencies up to date. The tool is configured to self-approve and merge automatically when it's a minor update (if all required checks pass, of course). Which means there's frequently zero reviews by humans over the configured period (14 days in that case), even if there are pull requests. I suspect this is what's causing the bug.