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Vance IngallsandClaude Fable 5
8826d2d71d
A window.__timelines entry is authored content and may be a partial RuntimeTimelineLike (duration/seek only, no pause). Timeline resolution is deliberately permissive — duration-based — and such compositions render fine, because the render path only seeks. But every interactive transport path (play/pause/seek, bind, rebind-tick, boot) called capturedTimeline.pause() unguarded, crashing studio playback with 'tl.pause is not a function' — the top recurring studio:unhandled_error in telemetry across versions 0.6.121 through 0.7.59 (~150-175/day). Guard all pause sites through one helper (typeof check + swallow, plus a once-per-page timeline_missing_pause analytics event so composition authors can find the partial timeline), matching the safeVoid pattern player.ts already uses. In the rebind restore path, pause is guarded separately so a missing pause() no longer aborts the seek/play restore behind it in the same try/catch. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>