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NaN != null is true, so all null-checks let NaN coordinates through to Leaflet which crashes with "Invalid LatLng object: (NaN, NaN)". Server: sanitize coordinates with Number.isFinite() before sending — NaN from bad grid lookups or prefix estimates now becomes null. Frontend: replaced all spot/path coordinate guards from spot.lat != null → Number.isFinite(spot.lat) in WorldMap.jsx (placeSpots, DX paths) and AzimuthalMap.jsx (POTA, WWFF, SOTA, WWBOTA, DX marker, spotter paths). Credit: Alan (alanhargreaves) caught this. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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NaN != null is true, so all null-checks let NaN coordinates through to Leaflet which crashes with "Invalid LatLng object: (NaN, NaN)".
Server: sanitize coordinates with Number.isFinite() before sending — NaN from bad grid lookups or prefix estimates now becomes null.
Frontend: replaced all spot/path coordinate guards from
spot.lat != null → Number.isFinite(spot.lat)
in WorldMap.jsx (placeSpots, DX paths) and AzimuthalMap.jsx (POTA, WWFF, SOTA, WWBOTA, DX marker, spotter paths).
Credit: Alan (alanhargreaves) caught this.
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server.js: caches have TTLs and size caps (we serve 2,000+ concurrent users)var(--accent-cyan), etc.).bak,.old,console.logdebug lines, or test scripts includedScreenshots (if visual change)