René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Uncatchable exception from webstream adapter","articleBody":"### Version\n\nv26.3.1\n\n### Platform\n\n```text\nMicrosoft Windows NT 10.0.19045.0 x64\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\nThe following code reproduces the bug:\n```typescript\nimport { connect, createServer } from \"net\";\nimport { Duplex } from \"stream\";\n\nconst server = createServer();\n\nserver.on(\"connection\", (socket) => {\n    socket.end();\n});\n\nserver.listen(8444, () => {\n    console.log(\"server listening on port 8444\");\n});\n\nconst socket = connect({ host: \"localhost\", port: 8444 });\nconst conn = Duplex.toWeb(socket);\n\nconst reader = conn.readable.getReader();\nconst writer = conn.writable.getWriter();\n\ntry {\n    await reader.read();\n    await writer.close();\n} catch {}\n```\n\n\n\n### How often does it reproduce? Is there a required condition?\n\nHappens consistently on Node 26.3.0 and 26.3.1\nDoesn't happen on Node 26.2.0\n\n### What is the expected behavior? Why is that the expected behavior?\n\nIt should not produce an uncatchable exception.\n\n### What do you see instead?\n\nNode will exit with the uncaught exception:\n```\nnode:internal/webstreams/adapters:224\n    controller.error(new AbortError());\n               ^\n\nTypeError: Cannot read properties of undefined (reading 'error')\n    at Socket.\u003canonymous> (node:internal/webstreams/adapters:224:16)\n    at Socket.\u003canonymous> (node:internal/util:581:20)\n    at Socket.onfinish (node:internal/streams/end-of-stream:238:16)\n    at Socket.emit (node:events:509:20)\n    at finish (node:internal/streams/writable:955:10)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n```\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/basro","@type":"Person","name":"basro"},"datePublished":"2026-06-24T22:32:46Z","url":"https://github.com/nodejs/node/issues/64120"}