Error in search function: Converting circular structure to JSON in HTTP Agent object

[Matti181]

Text:
Hello Firecrawl Team,
I'm encountering a critical error in the Firecrawl search function that suddenly appeared today. The application was working perfectly until about 5 hours ago, and now every search request

const response = await fetch(`https://my-selfhosted-server-url/v1/search`, {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify(body),
});

fails with the following error:
Details:

Error in search function {"error":{"name":"TypeError","message":"Converting circular structure to JSON
--> starting at object with constructor 'Agent'
| property 'sockets' -> object with constructor 'Object'
| property 'www.google.com:443::::::::true:::::::::::::' -> object with constructor 'Array'
| ...
| property '_httpMessage' -> object with constructor 'ClientRequest'
--- property 'agent' closes the circle"

Error type:

TypeError when trying to serialize circular structure to JSON
Location: The error occurs in the logger component at /app/dist/src/lib/logger.js:31:12
Root cause: The logger is attempting to stringify an HTTP Agent object with circular references
Timing: This error suddenly started occurring today without any changes on my end
Reproduction: Every search request now produces this error
Impact: The search functionality is completely broken
Specific endpoint affected: This error only occurs when using the https://api.firecrawl.dev/v1/search endpoint. Other endpoints seem to be working correctly.

Steps I've already taken:
Redeployed the entire application
Verified that my frontend code is sending valid requests
Confirmed that the error is occurring on the server side, not in my client code

Full error stack trace:
api-1 | 2025-03-11 13:31:18 error [:]: Error in search function {"error":{"name":"TypeError","message":"Converting circular structure to JSON\n --> starting at object with constructor 'Agent'\n | property 'sockets' -> object with constructor 'Object'\n | property 'www.google.com:443::::::::true:::::::::::::' -> object with constructor 'Array'\n | ...\n | property '_httpMessage' -> object with constructor 'ClientRequest'\n --- property 'agent' closes the circle","stack":"TypeError: Converting circular structure to JSON\n --> starting at object with constructor 'Agent'\n | property 'sockets' -> object with constructor 'Object'\n | property 'www.google.com:443::::::::true:::::::::::::' -> object with constructor 'Array'\n | ...\n | property '_httpMessage' -> object with constructor 'ClientRequest'\n --- property 'agent' closes the circle\n at JSON.stringify ()\n at Printf.template (/app/dist/src/lib/logger.js:31:12)\n at Printf.transform (/app/node_modules/.pnpm/logform@2.6.0/node_modules/logform/printf.js:11:26)\n at Format.transform (/app/node_modules/.pnpm/logform@2.6.0/node_modules/logform/combine.js:20:24)\n at Console._write (/app/node_modules/.pnpm/winston-transport@4.8.0/node_modules/winston-transport/modern.js:91:33)\n at writeOrBuffer (/app/node_modules/.pnpm/readable-stream@4.5.2/node_modules/readable-stream/lib/internal/streams/writable.js:334:12)\n at _write (/app/node_modules/.pnpm/readable-stream@4.5.2/node_modules/readable-stream/lib/internal/streams/writable.js:283:10)\n at Writable.write (/app/node_modules/.pnpm/readable-stream@4.5.2/node_modules/readable-stream/lib/internal/streams/writable.js:286:10)\n at DerivedLogger.ondata (/app/node_modules/.pnpm/readable-stream@3.6.2/node_modules/readable-stream/lib/_stream_readable.js:629:20)\n at DerivedLogger.emit (node:events:518:28)\n at addChunk (/app/node_modules/.pnpm/readable-stream@3.6.2/node_modules/readable-stream/lib/_stream_readable.js:279:12)\n at readableAddChunk (/app/node_modules/.pnpm/readable-stream@3.6.2/node_modules/readable-stream/lib/_stream_readable.js:262:11)\n at Readable.push (/app/node_modules/.pnpm/readable-stream@3.6.2/node_modules/readable-stream/lib/_stream_readable.js:228:10)\n at Transform.push (/app/node_modules/.pnpm/readable-stream@3.6.2/node_modules/readable-stream/lib/_stream_transform.js:132:32)\n at DerivedLogger._transform (/app/node_modules/.pnpm/winston@3.14.2/node_modules/winston/lib/winston/logger.js:313:12)\n at Transform._read (/app/node_modules/.pnpm/readable-stream@3.6.2/node_modules/readable-stream/lib/_stream_transform.js:166:10)"}}
^CGracefully stopping... (press Ctrl+C again to force)