diff --git a/packages/nodes-base/nodes/Aws/DynamoDB/utils.ts b/packages/nodes-base/nodes/Aws/DynamoDB/utils.ts
index 7d910ca68a..af9acad651 100644
--- a/packages/nodes-base/nodes/Aws/DynamoDB/utils.ts
+++ b/packages/nodes-base/nodes/Aws/DynamoDB/utils.ts
@@ -1,4 +1,4 @@
-import { deepCopy, IDataObject, INodeExecutionData } from 'n8n-workflow';
+import { deepCopy, IDataObject, INodeExecutionData, assert } from 'n8n-workflow';
 
 import {
 	AdjustedPutItem,
@@ -82,7 +82,11 @@ function decodeAttribute(type: AttributeValueType, attribute: string | IAttribut
 		case 'NS':
 			return attribute;
 		case 'M':
-			return simplify(attribute as IAttributeValue);
+			assert(
+				typeof attribute === 'object' && !Array.isArray(attribute) && attribute !== null,
+				'Attribute must be an object',
+			);
+			return simplify(attribute);
 		default:
 			return null;
 	}
diff --git a/packages/workflow/src/index.ts b/packages/workflow/src/index.ts
index 00f157d079..45028210c2 100644
--- a/packages/workflow/src/index.ts
+++ b/packages/workflow/src/index.ts
@@ -18,7 +18,7 @@ export * from './WorkflowErrors';
 export * from './WorkflowHooks';
 export * from './VersionedNodeType';
 export { LoggerProxy, NodeHelpers, ObservableObject, TelemetryHelpers };
-export { deepCopy, jsonParse, sleep, fileTypeFromMimeType } from './utils';
+export { deepCopy, jsonParse, sleep, fileTypeFromMimeType, assert } from './utils';
 export {
 	isINodeProperties,
 	isINodePropertyOptions,
diff --git a/packages/workflow/src/utils.ts b/packages/workflow/src/utils.ts
index 1a5d0aa051..d7fdbf26e6 100644
--- a/packages/workflow/src/utils.ts
+++ b/packages/workflow/src/utils.ts
@@ -74,3 +74,21 @@ export function fileTypeFromMimeType(mimeType: string): BinaryFileType | undefin
 	if (mimeType.startsWith('text/')) return 'text';
 	return;
 }
+
+export function assert<T>(condition: T, msg?: string): asserts condition {
+	if (!condition) {
+		const error = new Error(msg ?? 'Invalid assertion');
+		// hide assert stack frame if supported
+		if (Error.hasOwnProperty('captureStackTrace')) {
+			// V8 only - https://nodejs.org/api/errors.html#errors_error_capturestacktrace_targetobject_constructoropt
+			Error.captureStackTrace(error, assert);
+		} else if (error.stack) {
+			// fallback for IE and Firefox
+			error.stack = error.stack
+				.split('\n')
+				.slice(1) // skip assert function from stack frames
+				.join('\n');
+		}
+		throw error;
+	}
+}