Building a pathway crashed the whole page - #68
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Every pathway build died partway through streaming with
InvalidCharacterError: Failed to execute 'createElement' on 'Document':
The tag name provided ('') is not a valid name.
leaving "This page couldn't load" and no way forward.
A streamed partial step arrives with `purpose: ""` before the token lands —
confirmed, 4 occurrences in a single photosynthesis stream. The icon lookup
used `??`, which only replaces null/undefined, so an empty string fell
straight through:
('' && PURPOSE_META['']?.Icon) ?? Sparkles // => ''
React was then handed `<"" />` and threw from completeWork, taking the page
with it rather than one step. `||` treats the empty string as absent, which
is what was meant.
The neighbouring waypoint lookup had the same trap. It was benign — `''?.dot`
is undefined and the class fallback caught it — but it is fixed alongside so
the pattern does not get copied.
Repro: build any pathway. Verified fixed by driving the real page in a
browser — full build completes, zero exceptions.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Every pathway build died partway through streaming:
leaving "This page couldn't load" and no way forward.
Cause
A streamed partial step arrives with
purpose: ""before the token lands — confirmed, 4 occurrences in a singlephotosynthesisstream, not inferred. The icon lookup used??, which only replaces null/undefined, so an empty string fell straight through:React was then handed
<"" />and threw fromcompleteWork, taking the whole page down rather than one step.||treats the empty string as absent, which is what was meant.The neighbouring waypoint lookup had the identical trap. It was benign —
''?.dotis undefined and the class fallback caught it — but it's fixed alongside so the pattern doesn't get copied into the next widget.Verification
Driven in a real browser against the live page, not just reasoned about:
Typecheck clean, lint clean (0 errors; the 6 warnings are pre-existing).
Worth noting this reproduces on
mainand affects the deployed app for everyone, not just one environment.🤖 Generated with Claude Code