fix(error-tracking): handle missing initial event by hpouillot · Pull Request #71067 · PostHog/posthog

hpouillot · 2026-07-15T13:20:46Z

Problem

Opening an error tracking issue can trigger an initial-event query that returns no rows. The scene assumes the first row always exists and crashes instead of rendering the issue without a selected event.

Why: The query result is legitimately empty when no event matches the narrow timestamp window, so the frontend needs to handle that response as an empty state.

Changes

Read the initial event with optional access and return null when the query has no matching row or event.
Add a logic test covering an empty initial-event query result.

How did you test this code?

Added a focused logic regression test that catches the empty query result crash.
Ran git diff --check successfully.
I could not run Jest or the TypeScript check because this environment does not have the repository Node dependencies, hogli, or flox installed.

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Docs update

No documentation update is needed. This is a defensive fix that does not change the documented workflow or API.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Codex CLI investigated and implemented this change using the /investigating-error-issue and /writing-tests skills. The fix keeps the existing loader behavior and only handles the API's valid empty-result case instead of introducing a fallback query or changing timestamp selection.

Created with PostHog Code

Safely handle empty issue query results when loading the initial event and cover the regression with a focused logic test. Generated-By: PostHog Code Task-Id: 5e7bfcac-3a31-48cb-9148-db207e80307c

github-actions · 2026-07-15T13:20:58Z

Hey @hpouillot! 👋

It looks like your git author email on this PR isn't your @posthog.com address (hpouillot@gmail.com). Since you're on the PostHog team, it's worth pointing your local git author email at your @posthog.com address. Why it matters:

Consistent work identity in git history — internal tooling that attributes commits to team members keys off your @posthog.com address.
Keeps team contributions easy to tell apart from external community ones when scanning history.

You can fix it for this repo with:

git config user.email "you@posthog.com"

Or set it globally with git config --global user.email "you@posthog.com". No need to redo this PR — just a nudge for next time. 🙂

github-actions · 2026-07-15T13:21:46Z

🦔 Hogbox preview · ✅ ready

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🔑 Login	`test@posthog.com` / `12345678` (demo data)
🧩 Running	this PR's backend and frontend, on the PostHog `:master` base
🔗 Link	stable across rebuilds — a re-push swaps the box underneath, the URL stays
🔒 Access	tailnet only (PostHog VPN)
🛠️ Admin	inspect & debug state in hogland
💤 Idle	sleeps after ~30 min idle (snapshot to S3, zero node cost) and wakes on your next visit in ~30s, behind a brief "waking up" screen

_{commit c08c7be · box box-fa08d19e7308 · ready in 987s (push → usable) · build log · rebuilds on every push, torn down on close}

greptile-apps · 2026-07-15T13:23:34Z

_{Reviews (1): Last reviewed commit: "fix(error-tracking): handle missing init..." | Re-trigger Greptile}

github-actions · 2026-07-15T13:44:41Z

🤖 CI report

✅ Bundle size — 🟢 -25 B (-0.0%)

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 64.80 MiB · 🟢 -25 B (-0.0%)

No file changed by more than 1000 B.

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
entry (logged-out pages, app bootstrap) `src/index.tsx`	1.22 MiB · 22 files	no change	`███░░░░░░░` 28.4% of 4.29 MiB
authenticated shell (every logged-in page) `src/scenes/AuthenticatedShell.tsx`	8.15 MiB · 2,979 files	🟢 -25 B (-0.0%)	`█████████░` 88.1% of 9.25 MiB

🟢 node_modules/monaco-editor/ stays out of src/index.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 node_modules/monaco-editor/ stays out of src/scenes/AuthenticatedShell.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx

Largest files eagerly shipped from src/index.tsx

Size	File
126.8 KiB	`../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js`
24.6 KiB	`../node_modules/.pnpm/buffer@6.0.3/node_modules/buffer/index.js`
6.3 KiB	`../node_modules/.pnpm/react@18.3.1/node_modules/react/cjs/react.production.min.js`
4.5 KiB	`../node_modules/.pnpm/@jspm+core@2.1.0/node_modules/@jspm/core/nodelibs/browser/process.js`
3.9 KiB	`../node_modules/.pnpm/scheduler@0.23.2/node_modules/scheduler/cjs/scheduler.production.min.js`
1.4 KiB	`../node_modules/.pnpm/base64-js@1.5.1/node_modules/base64-js/index.js`
1.3 KiB	`src/RootErrorBoundary.tsx`
912 B	`../node_modules/.pnpm/ieee754@1.2.1/node_modules/ieee754/index.js`
789 B	`src/scenes/ChunkLoadErrorBoundary.tsx`
762 B	`src/index.tsx`

Largest files eagerly shipped from src/scenes/AuthenticatedShell.tsx

Size	File
281.1 KiB	`../node_modules/.pnpm/posthog-js@1.401.0/node_modules/posthog-js/dist/rrweb.js`
267.7 KiB	`../node_modules/.pnpm/@posthog+icons@0.38.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js`
235.5 KiB	`src/taxonomy/core-filter-definitions-by-group.json`
222.7 KiB	`../node_modules/.pnpm/posthog-js@1.401.0/node_modules/posthog-js/dist/module.js`
164.0 KiB	`src/queries/validators.js`
154.3 KiB	`../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js`
126.8 KiB	`../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js`
106.1 KiB	`src/lib/api.ts`
93.3 KiB	`../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js`
92.7 KiB	`../packages/quill/packages/quill/dist/index.js`

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of #32479}

✅ Dist folder size — 🟢 -506 B (-0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 1308.72 MiB · 🟢 -506 B (-0.0%)

trunk-io · 2026-07-15T13:53:57Z

_{View Full Report ↗︎ ⋅ Docs}

deployment-status-posthog · 2026-07-15T14:19:15Z

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-07-15 14:19 UTC	Run
prod-us	✅ Deployed	2026-07-15 14:45 UTC	Run
prod-eu	✅ Deployed	2026-07-15 14:46 UTC	Run

fix(error-tracking): handle missing initial event

c08c7be

Safely handle empty issue query results when loading the initial event and cover the regression with a focused logic test. Generated-By: PostHog Code Task-Id: 5e7bfcac-3a31-48cb-9148-db207e80307c

hpouillot self-assigned this Jul 15, 2026

hpouillot added the skip-inkeep-docs Use this label to skip an Inkeep docs PR in posthog.com label Jul 15, 2026 — with PostHog

hpouillot requested review from a team, ablaszkiewicz and cat-ph July 15, 2026 13:21

hpouillot marked this pull request as ready for review July 15, 2026 13:21

github-actions Bot deployed to preview-pr-71067 July 15, 2026 13:21 View deployment

ablaszkiewicz approved these changes Jul 15, 2026

View reviewed changes

hpouillot enabled auto-merge (squash) July 15, 2026 13:24

hpouillot merged commit 335a4d6 into master Jul 15, 2026
270 of 325 checks passed

hpouillot deleted the posthog-code/fix-error-tracking-empty-initial-event branch July 15, 2026 13:48

hpouillot mentioned this pull request Jul 24, 2026

Sprint July 27 to August 7 #72561

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fix(error-tracking): handle missing initial event - #71067

fix(error-tracking): handle missing initial event#71067
hpouillot merged 1 commit into
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posthog-code/fix-error-tracking-empty-initial-event

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hpouillot commented Jul 15, 2026

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