fix: guard null PIXI stage and detach spiderhog listener on teardown

[posthog]

What

Fixes a rare uncaught TypeError: Cannot read properties of null (reading 'addChild') in the toolbar-embedded hedgehog mode.

The spiderhog skin registers a global pointerdown listener that spawns a SpiderWebActor on every click. HedgeHogMode.destroy() tore down the PIXI app (app.destroy()) without unloading its elements, so that listener stayed attached after teardown. A later click then spawned onto a destroyed app and dereferenced a null app.stage in Actor.loadSpriteFrames. The same null-stage window exists briefly before app.init() resolves.

Changes

• destroy() now calls beforeUnload() on every element before destroying the app, so ability-owned listeners — notably the spiderhog pointerdown — detach and can't fire post-teardown.
• Actor.loadSpriteFrames, SpiderWebActor.spawn, and the removeChild sites bail when the stage is absent, so any stray spawn during the init/teardown gap no-ops instead of crashing.
• Bumps the package to 0.0.54 (auto-published on merge to main).

Why

Genuine uncaught crash in production-served toolbar code. Impact is small — it's an opt-in cosmetic easter egg and needs a narrow pointerdown timing race — but the fix is cheap and self-contained.

Testing

• pnpm lint and pnpm build pass.
• Added test/spider-web-actor.test.ts covering the spawn null-stage guard.

Note: after this publishes, bump @posthog/hedgehog-mode in PostHog/posthog (frontend/package.json) to ^0.0.54 to pull the fix into the toolbar.

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Created with PostHog Code from an inbox report.

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Project	Deployment	Actions	Updated (UTC)
hedgehog-mode	Ready	Preview	Jul 15, 2026 3:40am
hogwars	Error		Jul 15, 2026 3:40am

[richardsolomou]

this should cancel element-owned timers and tweens during teardown, or make beforeUnload() idempotent. released webs and flames retain callbacks that later call removeElement(). after this sweep has already cleaned them up, those callbacks repeat cleanup, decrement the global spawn counters twice, and may destroy PIXI resources twice.