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## Summary - `nextHop()` schedules `setInterval`/`setTimeout` callbacks that can fire after `destroy()` has set `animLayer = null` and removed DOM elements - This caused three console errors on the Live page when navigating away mid-animation: `Cannot read properties of null (reading 'hasLayer')` and `Cannot set properties of null (setting 'textContent')` - Added null guards at each async callback site; no behavioral change when the page is active ## Changes - `public/live.js`: early return if `animLayer` is null at start of `nextHop()`; null-safe `animLayer.hasLayer` checks in `setInterval`/`setTimeout`; null-safe `liveAnimCount` element access - `public/index.html`: cache buster bumped - `test-frontend-helpers.js`: 4 source-inspection tests verifying the null guards are present ## Test plan - [ ] Open Live page, trigger some packet animations, navigate away quickly — no console errors - [ ] `node test-frontend-helpers.js` passes (233 tests, 0 failures) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
