n8n-io/n8n · error

CONNECTION_TYPE_INFERENCE_FAILED

CONNECTION_TYPE_INFERENCE_FAILED

Error message

Could not infer connection type

What it means

Error "Could not infer connection type" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/ai-workflow-builder.ee/src/tools/connect-nodes.tool.ts:164

						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,
						},
					};
					reporter.error(error);
					return createErrorResponse(config, error);
				}

				const connectionType = inferResult.connectionType;
				const inferredSwap = inferResult.requiresSwap ?? false;

				// If swap is required from inference, swap the nodes
				if (inferredSwap) {
					logger?.debug('Swapping nodes based on inference result');
					const temp = matchedSourceNode;
					matchedSourceNode = matchedTargetNode;
					matchedTargetNode = temp;

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/ai-workflow-builder.ee/src/tools/connect-nodes.tool.ts:164 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/a8e8173ab0497db3. Report an issue: GitHub.