Failed to load existing workflow ${workflowId} to preserve w

Error message

Failed to load existing workflow ${workflowId} to preserve webhook IDs: ${message}

What it means

Error "Failed to load existing workflow ${workflowId} to preserve webhook IDs: ${message}" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/instance-ai/src/tools/workflows/workflow-json-utils.ts:153

 * For updates, preserve existing webhookIds by node name so URLs remain stable.
 */
export async function ensureWebhookIds(
	json: WorkflowJSON,
	workflowId: string | undefined,
	ctx: InstanceAiContext,
): Promise<void> {
	const existingWebhookIds = new Map<string, string>();
	if (workflowId) {
		try {
			const existing = await ctx.workflowService.getAsWorkflowJSON(workflowId);
			for (const node of existing.nodes ?? []) {
				if (node.webhookId && node.name) {
					existingWebhookIds.set(node.name, node.webhookId);
				}
			}
		} catch (error) {
			const message = error instanceof Error ? error.message : String(error);
			throw new Error(
				`Failed to load existing workflow ${workflowId} to preserve webhook IDs: ${message}`,
				{ cause: error },
			);
		}
	}

	for (const node of json.nodes ?? []) {
		if (WEBHOOK_NODE_TYPES.has(node.type) && !node.webhookId) {
			node.webhookId = (node.name && existingWebhookIds.get(node.name)) ?? randomUUID();
		}
	}
}

/**
 * For updates, preserve existing node-group IDs by group name. The sandbox SDK
 * build has no view of the saved workflow, so toJSON() mints a fresh deterministic
 * ID for every group — overwriting the stable ID of a group the user created in
 * the editor. Reconciling by name here keeps it stable, mirroring ensureWebhookIds.

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/instance-ai/src/tools/workflows/workflow-json-utils.ts:153 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/b27e557c65cd3b45. Report an issue: GitHub.