gatsbyjs/gatsby · error

Plugin ${pluginName} called unstable_createNodeManifest with

Error message

Plugin ${pluginName} called unstable_createNodeManifest with a manifestId that isn't a string.

What it means

Validation inside nodeManifestReducer: unstable_createNodeManifest was called with a manifestId that is not a string. The reducer rejects the manifest (returns state unchanged) and warns, since manifest ids must be strings to key content-update events for incremental builds.

Source

Thrown at packages/gatsby/src/redux/reducers/node-manifest.ts:45

          !isNaN(nodeLastUpdatedAtUTC)
        ) {
          reporter.warn(
            `Plugin ${pluginName} called unstable_createNodeManifest with an updatedAtUTC that isn't a proper value to instantiate a Date.`
          )

          return state
        }

        const shouldCreateNodeManifest =
          Date.now() - nodeLastUpdatedAtUTC <= maxDaysOld * ONE_DAY

        if (!shouldCreateNodeManifest) {
          return state
        }
      }

      if (typeof manifestId !== `string`) {
        reporter.warn(
          `Plugin ${pluginName} called unstable_createNodeManifest with a manifestId that isn't a string.`
        )

        return state
      }

      if (!node?.id) {
        reporter.warn(
          `Plugin ${pluginName} called unstable_createNodeManifest but didn't provide a node.`
        )

        return state
      }

      state.push({
        manifestId,
        pluginName,
        node: {

View on GitHub (pinned to e85d62f177)

Solutions

1. Coerce the id to a string before calling unstable_createNodeManifest (e.g. String(id) or the node's contentDigest)
2. Ensure the plugin generates a stable string manifestId per node
3. Update the source plugin version

When it happens

Trigger: Thrown at packages/gatsby/src/redux/reducers/node-manifest.ts:45 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gatsbyjs/gatsby@e85d62f177 (2026-08-26). Data as JSON: /api/errors/817fc7ccb868b6e1. Report an issue: GitHub.