fix(cli): Fix issue with n8n crashing when error in poll method

packages/cli/src/ActiveWorkflowRunner.ts

@@ -57,6 +57,7 @@ import { User } from './databases/entities/User';
 import { whereClause } from './WorkflowHelpers';
 import { WorkflowEntity } from './databases/entities/WorkflowEntity';
 import * as ActiveExecutions from './ActiveExecutions';
+import { createErrorExecution } from './GenericHelpers';
 
 const activeExecutions = ActiveExecutions.getInstance();
 
@@ -650,7 +651,14 @@ export class ActiveWorkflowRunner {
 				activation,
 			);
 			// eslint-disable-next-line no-underscore-dangle
-			returnFunctions.__emit = (data: INodeExecutionData[][]): void => {
+			returnFunctions.__emit = async (
+				data: INodeExecutionData[][] | ExecutionError,
+			): Promise<void> => {
+				if (data instanceof Error) {
+					await createErrorExecution(data, node, workflowData, workflow, mode);
+					this.executeErrorWorkflow(data, workflowData, mode);
+					return;
+				}
 				// eslint-disable-next-line @typescript-eslint/restrict-template-expressions
 				Logger.debug(`Received event to trigger execution for workflow "${workflow.name}"`);
 				WorkflowHelpers.saveStaticData(workflow);

packages/cli/src/GenericHelpers.ts

@@ -8,12 +8,27 @@
 import express from 'express';
 import { join as pathJoin } from 'path';
 import { readFile as fsReadFile } from 'fs/promises';
-import { IDataObject } from 'n8n-workflow';
+import {
+	ExecutionError,
+	IDataObject,
+	INode,
+	IRunExecutionData,
+	Workflow,
+	WorkflowExecuteMode,
+} from 'n8n-workflow';
 import { validate } from 'class-validator';
 import config from '../config';
 
 // eslint-disable-next-line import/no-cycle
-import { Db, ICredentialsDb, IPackageVersions, ResponseHelper } from '.';
+import {
+	Db,
+	ICredentialsDb,
+	IExecutionDb,
+	IExecutionFlattedDb,
+	IPackageVersions,
+	IWorkflowDb,
+	ResponseHelper,
+} from '.';
 // eslint-disable-next-line import/order
 import { Like } from 'typeorm';
 // eslint-disable-next-line import/no-cycle
@@ -214,4 +229,85 @@ export async function validateEntity(
 	}
 }
 
+/**
+ * Create an error execution
+ *
+ * @param {INode} node
+ * @param {IWorkflowDb} workflowData
+ * @param {Workflow} workflow
+ * @param {WorkflowExecuteMode} mode
+ * @returns
+ * @memberof ActiveWorkflowRunner
+ */
+// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
+export async function createErrorExecution(
+	error: ExecutionError,
+	node: INode,
+	workflowData: IWorkflowDb,
+	workflow: Workflow,
+	mode: WorkflowExecuteMode,
+): Promise<void> {
+	const saveDataErrorExecutionDisabled = workflowData?.settings?.saveDataErrorExecution === 'none';
+
+	if (saveDataErrorExecutionDisabled) return;
+
+	const executionData: IRunExecutionData = {
+		startData: {
+			destinationNode: node.name,
+			runNodeFilter: [node.name],
+		},
+		executionData: {
+			contextData: {},
+			nodeExecutionStack: [
+				{
+					node,
+					data: {
+						main: [
+							[
+								{
+									json: {},
+									pairedItem: {
+										item: 0,
+									},
+								},
+							],
+						],
+					},
+					source: null,
+				},
+			],
+			waitingExecution: {},
+			waitingExecutionSource: {},
+		},
+		resultData: {
+			runData: {
+				[node.name]: [
+					{
+						startTime: 0,
+						executionTime: 0,
+						error,
+						source: [],
+					},
+				],
+			},
+			error,
+			lastNodeExecuted: node.name,
+		},
+	};
+
+	const fullExecutionData: IExecutionDb = {
+		data: executionData,
+		mode,
+		finished: false,
+		startedAt: new Date(),
+		workflowData,
+		workflowId: workflow.id,
+		stoppedAt: new Date(),
+	};
+
+	const execution = ResponseHelper.flattenExecutionData(fullExecutionData);
+
+	await Db.collections.Execution.save(execution as IExecutionFlattedDb);
+}
+
 export const DEFAULT_EXECUTIONS_GET_ALL_LIMIT = 20;

packages/core/src/ActiveWorkflows.ts

@@ -163,24 +163,35 @@ export class ActiveWorkflows {
 
 		// Get all the trigger times
 		const cronTimes = (pollTimes.item || []).map(toCronExpression);
-
 		// The trigger function to execute when the cron-time got reached
-		const executeTrigger = async () => {
+		const executeTrigger = async (testingTrigger = false) => {
 			// eslint-disable-next-line @typescript-eslint/restrict-template-expressions
 			Logger.debug(`Polling trigger initiated for workflow "${workflow.name}"`, {
 				workflowName: workflow.name,
 				workflowId: workflow.id,
 			});
-			const pollResponse = await workflow.runPoll(node, pollFunctions);
 
-			if (pollResponse !== null) {
-				// eslint-disable-next-line no-underscore-dangle
-				pollFunctions.__emit(pollResponse);
+			try {
+				const pollResponse = await workflow.runPoll(node, pollFunctions);
+
+				if (pollResponse !== null) {
+					// eslint-disable-next-line no-underscore-dangle
+					pollFunctions.__emit(pollResponse);
+				}
+			} catch (error) {
+				// If the poll function failes in the first activation
+				// throw the error back so we let the user know there is
+				// an issue with the trigger.
+				if (testingTrigger) {
+					throw error;
+				}
+				// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access, no-underscore-dangle
+				pollFunctions.__emit(error);
 			}
 		};
 
 		// Execute the trigger directly to be able to know if it works
-		await executeTrigger();
+		await executeTrigger(true);
 
 		const timezone = pollFunctions.getTimezone();
 

packages/workflow/src/Interfaces.ts

@@ -716,7 +716,7 @@ export interface IHookFunctions {
 }
 
 export interface IPollFunctions {
-	__emit(data: INodeExecutionData[][]): void;
+	__emit(data: INodeExecutionData[][] | NodeApiError): void;
 	getCredentials(type: string): Promise<ICredentialDataDecryptedObject>;
 	getMode(): WorkflowExecuteMode;
 	getActivationMode(): WorkflowActivateMode;