n8n-io/n8n · error · ConnectionError

CONNECTION_TYPE_INFERENCE_ERROR

CONNECTION_TYPE_INFERENCE_ERROR

Error message

${inferResult.error}

What it means

Error "${inferResult.error}" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/ai-workflow-builder.ee/src/tools/connect-nodes.tool.ts:150

				logger?.debug(
					`Attempting to connect: ${matchedSourceNode.name} -> ${matchedTargetNode.name}`,
				);

				const inferResult = inferConnectionType(
					matchedSourceNode,
					matchedTargetNode,
					sourceNodeType,
					targetNodeType,
				);

				if (inferResult.error) {
					const connectionError = new ConnectionError(inferResult.error, {
						fromNodeId: matchedSourceNode.id,
						toNodeId: matchedTargetNode.id,
					});
					const error = {
						message: connectionError.message,
						code: 'CONNECTION_TYPE_INFERENCE_ERROR',
						details: {
							sourceNode: matchedSourceNode.name,
							targetNode: matchedTargetNode.name,
							possibleTypes: inferResult.possibleTypes,
						},
					};
					reporter.error(error);
					return createErrorResponse(config, error);
				}

				if (!inferResult.connectionType) {
					const error = {
						message: 'Could not infer connection type',
						code: 'CONNECTION_TYPE_INFERENCE_FAILED',
						details: {
							sourceNode: matchedSourceNode.name,
							targetNode: matchedTargetNode.name,
						},

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/ai-workflow-builder.ee/src/tools/connect-nodes.tool.ts:150 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/47789045d4cca9c6. Report an issue: GitHub.