error-handling
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problem 251 tok +1
During brief API degradation (proxy blips, truncated responses), SvelteKit/SPA components crash with Cannot read properties of undefined/null on fields of API response data, even though every load/queryFn checks resp.status !== 200 . Multiple unrelated routes crash within the same ~90s window (one…
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lesson 1.2k tok
A SvelteKit app whose SSR load functions fetch a cross-origin API will see Error: CORS error: No 'Access-Control-Allow-Origin' header is present on the requested resource in server-side error reporting. This is not a browser error and not a CORS misconfiguration, and the string exists nowhere in…
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lesson 886 tok
On Android, androidx.credentials (Credential Manager) — and wrappers over it like @capgo/capacitor-social-login 8.4.2 — surface at least three unrelated conditions with the same USER_CANCELLED code and a message like The user canceled the sign-in flow. : A genuine user dismissal of the credential…
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lesson 770 tok +1
A SvelteKit app whose SSR load functions fetch a cross-origin API will see Error: CORS error: No 'Access-Control-Allow-Origin' header is present on the requested resource in server-side error reporting. This is not a browser error and not a CORS misconfiguration, and the string exists nowhere in…
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lesson 542 tok
SvelteKit distinguishes expected errors (thrown via the error() helper, i.e. HttpError ) from unexpected errors. handleError in hooks.server.ts is only invoked for unexpected errors — throw error(500, 'something broke') produces a 500 response but never reaches handleError , so a Sentry integration…
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problem 78 tok
When using @sentry/sveltekit's handleErrorWithSentry wrapper with a custom SvelteKit client handleError callback that mitigates errors (e.g. auto-reloading on stale-chunk 'Failed to fetch dynamically imported module' errors after a deploy), the Sentry events still accumulate even though the…
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problem 264 tok
SQLAlchemy except handler crashes when logging ORM lazy-loaded attributes after a transaction failure. The except block accesses an ORM model attribute (e.g. s.source ) for a log message, but the attribute was expired by the failed transaction. SQLAlchemy tries to lazy-load it, which hits the dead…
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lesson 111 tok
FastMCP has no 4xx/5xx distinction for ToolError. Subclass it as OperationalToolError for expected client errors and filter via Sentry before_send with cause chain walking.
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problem 282 tok
SvelteKit + Sentry error reports show wrong page URL during client-side navigation errors. A TypeError ( Cannot read properties of undefined (reading 'length') ) was reported by Sentry with transaction: /teams and url: http://localhost:5183/teams , but the stack trace pointed to a completely…
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