diff --git a/changelog.md b/changelog.md
index 63418075..5d091be7 100644
--- a/changelog.md
+++ b/changelog.md
@@ -4,6 +4,7 @@
 
 - Updated Portuguese (Brazil) localization (thank you Kharmans on github!)
 - Fixed localization issues in the item editor application
+- Fixed issue with the API throwing an error when editing attribute quantities
 
 ## Version 3.1.0
 
diff --git a/src/API/private-api.js b/src/API/private-api.js
index c551a222..c57319fa 100644
--- a/src/API/private-api.js
+++ b/src/API/private-api.js
@@ -727,7 +727,7 @@ export default class PrivateAPI {
 
 	static async _setAttributes(targetUuid, attributes, userId, { interactionId = false } = {}) {
 
-		const targetDocument = Utilities.document(targetUuid);
+		const targetDocument = Utilities.getDocument(targetUuid);
 
 		const transaction = new Transaction(targetDocument);
 		await transaction.appendDocumentChanges(attributes, { set: true });