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gemini-cli - 💡(How to fix) Fix Corrupted metadata line can hide the whole session [1 participants]

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google-gemini/gemini-cli#27276•Fetched 2026-05-20 03:59:35
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jpmartins98jpmartins98
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Root Cause

The loader should attempt recovery before giving up. It can use the filename short ID, later $set records, valid message records, or a best-effort reconstructed metadata object. If it still cannot recover, it should quarantine the file instead of letting cleanup delete it. A valid conversation should not be lost because the first line is the only accepted source of identity

Code Example

for await (const line of rl) {
    if (!line.trim()) continue;
    try {
      const record = JSON.parse(line) as unknown;

---

} catch {
    // ignore parse errors on individual lines
  }

---

if (!metadata.sessionId || !metadata.projectHash) {
    return await parseLegacyRecordFallback(filePath, options);
  }

---

╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                                                                                                                                                                                                                 │
│ About Gemini CLI                                                                                                                                                                                                                                                                │
│                                                                                                                                                                                                                                                                                 │
│ CLI Version                                                                                    0.42.0                                                                                                                                                                           │
│ Git Commit                                                                                     68e2196d5                                                                                                                                                                        │
│ Model                                                                                          Auto (Gemini 3)                                                                                                                                                                  │
│ Sandbox                                                                                        no sandbox                                                                                                                                                                       │
│ OS                                                                                             linux                                                                                                                                                                            │
│ Auth Method                                                                                    Signed in with Google                                                                                                                            │
│ Tier                                                                                           Gemini Code Assist in Google One AI Pro                                                                                                                                          │
│                                                                                                                                                                                                                                                                                 │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
RAW_BUFFERClick to expand / collapse

What happened?

The JSONL reader ignores parse errors on individual lines. That sounds resilient, but the metadata line is special. If the first metadata line is truncated or malformed, metadata.sessionId and metadata.projectHash may never be set. The loader then falls back to legacy parsing and returns null. All later valid messages are ignored for listing/resume purposes. A single bad metadata line can make a large conversation disappear from the session list.

packages/core/src/services/chatRecordingService.ts:140

for await (const line of rl) {
   if (!line.trim()) continue;
   try {
     const record = JSON.parse(line) as unknown;

packages/core/src/services/chatRecordingService.ts:232

  } catch {
    // ignore parse errors on individual lines
  }

packages/core/src/services/chatRecordingService.ts:237

  if (!metadata.sessionId || !metadata.projectHash) {
    return await parseLegacyRecordFallback(filePath, options);
  }

What did you expect to happen?

The loader should attempt recovery before giving up. It can use the filename short ID, later $set records, valid message records, or a best-effort reconstructed metadata object. If it still cannot recover, it should quarantine the file instead of letting cleanup delete it. A valid conversation should not be lost because the first line is the only accepted source of identity

Client information

<details> <summary>Client Information</summary>

Run gemini to enter the interactive CLI, then run the /about command.

╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                                                                                                                                                                                                                 │
│ About Gemini CLI                                                                                                                                                                                                                                                                │
│                                                                                                                                                                                                                                                                                 │
│ CLI Version                                                                                    0.42.0                                                                                                                                                                           │
│ Git Commit                                                                                     68e2196d5                                                                                                                                                                        │
│ Model                                                                                          Auto (Gemini 3)                                                                                                                                                                  │
│ Sandbox                                                                                        no sandbox                                                                                                                                                                       │
│ OS                                                                                             linux                                                                                                                                                                            │
│ Auth Method                                                                                    Signed in with Google                                                                                                                            │
│ Tier                                                                                           Gemini Code Assist in Google One AI Pro                                                                                                                                          │
│                                                                                                                                                                                                                                                                                 │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
</details>

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gemini-cli - 💡(How to fix) Fix Corrupted metadata line can hide the whole session [1 participants]