Exceptions lead to invalid session JSONL.

[ysazhm0109-boop]

claude-sdk.js 576

for await (const message of queryInstance) {
...
ws.send({
type: 'claude-response',
data: transformedMessage,
sessionId: capturedSessionId || sessionId || null
});
....
}

If an exception occurs inside the for await (const message of queryInstance) loop—for example, when the WebSocket disconnects (user closes the page right after starting the conversation)—ws.send throws an error and breaks the JSONL write. You're left with only the partial entry {"type":"queue-operation","operation":"dequeue",...}. When the session restarts, the Claude Code SDK generates a new sessionId, so the old and new IDs don't match anymore.

[blackmammoth]

@ysazhm0109-boop Thanks for raising the issue! I will notify you when a fix is released.