{"id":"is-same-tree-null-guards-before-value-access","text":"`is_same_tree` checks both-None and one-None cases before any `.val` access, guaranteeing no `AttributeError` on `None` nodes.","truth_value":"IN","source":"entries/2026/06/06/same-tree-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"is-same-tree-null-guards-before-value-access","truth_value":"IN","reason":"premise"}]}}