MISSING_TRIGGER

MISSING_TRIGGER

Error message

Workflow has no trigger node. It will need to be started manually.

What it means

Error "Workflow has no trigger node. It will need to be started manually." thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/workflow-sdk/src/workflow-builder/plugins/validators/missing-trigger-validator.ts:41

	// Per-node validation not used - we do workflow-level validation
	validateNode: (): ValidationIssue[] => [],

	validateWorkflow(ctx: PluginContext): ValidationIssue[] {
		// Check if the allowNoTrigger option is set
		if (ctx.validationOptions?.allowNoTrigger) {
			return [];
		}

		// Check if any node is a trigger
		const hasTrigger = [...ctx.nodes.values()].some((graphNode) =>
			isTriggerNodeType(graphNode.instance.type),
		);

		if (!hasTrigger) {
			return [
				{
					code: 'MISSING_TRIGGER',
					message: 'Workflow has no trigger node. It will need to be started manually.',
					severity: 'informational',
				},
			];
		}

		return [];
	},
};

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/workflow-sdk/src/workflow-builder/plugins/validators/missing-trigger-validator.ts:41 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/ca2ff34f182d2332. Report an issue: GitHub.