n8n-io/n8n · error · Error

Agent run was aborted

Error message

Agent run was aborted

What it means

Thrown by the Set node validator (v3.3+) when parameters.assignments is present but is not an object/record. The correct shape is an object containing an assignments array: { assignments: [...] }. A bare array, string, or number here is a structural mistake.

Source

Thrown at packages/@n8n/agents/src/runtime/loop/agent-runtime.ts:686

				? { onStepEnd: options.onStepEnd ?? options.onStepFinish }
				: {}),
			repairToolCall: async (options) => {
				return await fixToolCall(
					{
						toolCall: options.toolCall,
						error: options.error,
					},
					toolMap,
				);
			},
		};
	}

	/** Throw (and mark the run cancelled) if the abort scope has fired. */
	private assertNotAborted(abortScope: AgentAbortScope): void {
		if (abortScope.isAborted) {
			this.updateState({ status: 'cancelled' });
			throw new Error('Agent run was aborted');
		}
	}

	/** Build the shared services the output sinks call into for terminal concerns. */
	private createRunServices(): RunServices {
		return {
			runId: this.runId,
			modelId: this.modelIdString,
			applyCost: (usage) => this.applyCost(usage),
			saveToMemory: async (list, options) => await this.memory.saveToMemory(list, options),
			maybeGenerateTitle: async (list, options) => await this.maybeGenerateTitle(list, options),
			flushTelemetry: async (options) => await this.telemetry.flush(options),
			cleanupRun: async () => await this.cleanupRun(),
			updateState: (patch) => this.updateState(patch),
			emitAgentEnd: (messages) => this.eventBus.emit({ type: AgentEvent.AgentEnd, messages }),
			getState: () => this.getState(),
		};
	}

View on GitHub (pinned to 5ac6606e81)

Solutions

1. Wrap the array: set parameters.assignments to { assignments: [ ...your assignment objects ] }.
2. If you did not intend to set assignments, remove the key entirely (undefined is allowed and skips validation).
3. Re-check the v3.3 assignment schema: each entry needs id, name, value, type.

Example fix

// before
set({
  name: 'Set X',
  assignments: [{ id: '1', name: 'x', value: 1, type: 'number' }],
});

// after
set({
  name: 'Set X',
  assignments: {
    assignments: [{ id: '1', name: 'x', value: 1, type: 'number' }],
  },
});

function isRecord(v: unknown): v is Record<string, unknown> {
  return typeof v === 'object' && v !== null && !Array.isArray(v);
}

// before building:
if (params.assignments !== undefined && !isRecord(params.assignments)) {
  throw new Error('parameters.assignments must be an object { assignments: [...] }');
}

function isRecord(v: unknown): v is Record<string, unknown> {
  return typeof v === 'object' && v !== null && !Array.isArray(v);
}

When it happens

Trigger: nodeVersion >= 3.3 AND params.assignments !== undefined AND isRecord(assignments) is false (it is null, an array, or a primitive).

Common situations: An AI builder writes assignments: [{...}] (an array) instead of assignments: { assignments: [{...}] }; mis-reading the v3.3 schema; flattening the structure during a refactor.

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AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/c01ed181c5137206. Report an issue: GitHub.