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All 9 chart components now have early-return null/empty checks before calling .map() on data props. The diversity-metrics chart guards all nested array fields (byCountry, byCategory, byOceanIssue, byTag). Analytics backend guards p.tags in getDiversityMetrics. This prevents any "Cannot read properties of null (reading 'map')" crashes even if upstream data shapes are unexpected. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>