fix(runner): don't set contentType on Actor.setValue with object payload - #24
Merged
DaveHanns merged 1 commit intoJul 3, 2026
Conversation
The RUNNER-STARTED-AT KVS write in actors/runner/src/main.ts:238
crashes at boot with:
ArgumentError: The "value" parameter must be a String, Buffer or Stream
when "options.contentType" is specified.
Apify SDK requires: when contentType is set, value must be a
String/Buffer/Stream (pre-serialized). buildRunnerStartedPayload
returns an object.
Fix: drop the {contentType: 'application/json'} options argument
entirely. Without options, Apify SDK auto-JSON-stringifies objects
and defaults contentType to application/json — same result, no
serialization mismatch.
The bug was cherry-picked from PR chocholous#17 in PR chocholous#23 (EF2 v2 recovery)
and only surfaced when the runner was rebuilt off main and ran an
actual scenario.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
The RUNNER-STARTED-AT KVS write introduced in PR #23 (EF2 v2 recovery, cherry-picked from stranded PR #17) crashes the runner at boot with:
buildRunnerStartedPayloadreturns an object; Apify SDK requires pre-serialized values whencontentTypeis set.Fix
Drop the
{contentType: 'application/json'}options arg. Without options, Apify SDK auto-JSON-stringifies the object and defaults contentType to application/json — same result, no serialization mismatch.Verified
Vf9ij9PGNjKLUnwOWon taskyy68NrrQ3zTQOlnDl(davehan runner, buildzQSdde5VxSiiKoVoA) crashed at 13:41:41.301Z.npm run build --workspacespasses; shared tests pass.Generated with Claude Code (https://claude.com/claude-code)