What causes "Resource references an unknown session: ${sessionId}" in chatboxai/chatbox?

Add the missing session entry to manifest.sessions.

Resource references an unknown session: ${sessionId}

Error message

Resource references an unknown session: ${sessionId}

What it means

Thrown when a resource lists a sessionId that does not correspond to any session in manifest.sessions. Every session referenced by a resource must exist, so dangling references are rejected.

Source

Thrown at src/renderer/packages/backup/types.ts:116

    if (sessionIds.has(session.id)) throw new Error(`Duplicate session id in manifest: ${session.id}`)
    sessionIds.add(session.id)
    if (session.meta.id !== session.id) throw new Error(`Session metadata id does not match: ${session.id}`)
  }
  for (const resource of manifest.resources) {
    if (resourceIds.has(resource.id)) throw new Error(`Duplicate resource id in manifest: ${resource.id}`)
    resourceIds.add(resource.id)
    const ownResourceKeys = new Set<string>()
    for (const key of resource.originalStorageKeys) {
      if (ownResourceKeys.has(key)) throw new Error(`Resource contains a duplicate storage key: ${resource.id}`)
      ownResourceKeys.add(key)
      if (resourceKeys.has(key)) throw new Error(`Duplicate resource storage key in manifest: ${key}`)
      resourceKeys.add(key)
    }
    const ownSessionIds = new Set<string>()
    for (const sessionId of resource.sessionIds) {
      if (ownSessionIds.has(sessionId)) throw new Error(`Resource contains a duplicate session id: ${resource.id}`)
      ownSessionIds.add(sessionId)
      if (!sessionIds.has(sessionId)) throw new Error(`Resource references an unknown session: ${sessionId}`)
    }
    if (resource.scope === 'session' && resource.sessionIds.length !== 1) {
      throw new Error(`Session-scoped resource must reference exactly one session: ${resource.id}`)
    }
    if (resource.scope === 'global' && resource.sessionIds.length !== 0) {
      throw new Error(`Global resource must not reference a session: ${resource.id}`)
    }
  }
  const resourcesById = new Map(manifest.resources.map((resource) => [resource.id, resource]))
  const sessionsById = new Map(manifest.sessions.map((session) => [session.id, session]))
  for (const session of manifest.sessions) {
    const ownResourceIds = new Set<string>()
    for (const resourceId of session.resourceIds) {
      if (ownResourceIds.has(resourceId)) throw new Error(`Session contains a duplicate resource id: ${session.id}`)
      ownResourceIds.add(resourceId)
      if (!resourceIds.has(resourceId)) throw new Error(`Session references an unknown resource: ${resourceId}`)
      if (!resourcesById.get(resourceId)?.sessionIds.includes(session.id)) {
        throw new Error(`Session/resource mapping is inconsistent: ${session.id}/${resourceId}`)

View on GitHub (pinned to 81571269ad)

Solutions

Add the missing session entry to manifest.sessions.
Remove the dangling sessionId from the resource.
Re-export sessions and resources together.

Example fix

// before
// resource references a session not in manifest.sessions

// after
const ids = new Set(manifest.sessions.map((s) => s.id))
for (const r of manifest.resources) {
  r.sessionIds = r.sessionIds.filter((id) => ids.has(id))
}

Defensive patterns

Strategy: try-catch

Validate before calling

function findDanglingSessionRefs(manifest: BackupManifest): string[] {
  const ids = new Set(manifest.sessions.map((s) => s.id))
  const dups = new Set<string>()
  for (const r of manifest.resources) for (const sid of r.sessionIds) if (!ids.has(sid)) dups.add(sid)
  return [...dups]
}

Try / catch

try {
  validateBackupManifestGraph(manifest)
} catch (error) {
  if (/references an unknown session/.test((error as Error).message)) pruneDanglingSessionRefs(manifest)
  throw error
}

Prevention

Always export sessions and their resources together.
When deleting a session, remove it from every resource's sessionIds.
Normalize id casing/whitespace before packing the manifest.

When it happens

Trigger: resource.sessionIds contains an id not present among the manifest.sessions ids.

Common situations: A session was deleted after resources were attached; a partial export that included resources but not their sessions; mismatched id casing.

Related errors

AI-assisted analysis of chatboxai/chatbox@81571269ad (2026-08-12). Data as JSON: /api/errors/27ba4b6d1fb63613. Report an issue: GitHub.