diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b820f22c3..61f7367c4e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,13 @@
 You should also include the user name that made the change.
 -->
 
+## 13.x.x (unreleased)
+
+### Improvements
+
+### Bugfixes
+- Aiscript: button is not defined
+
 ## 13.1.7 (2023/01/22)
 
 ### Improvements
diff --git a/packages/frontend/src/scripts/aiscript/ui.ts b/packages/frontend/src/scripts/aiscript/ui.ts
index b1895a5f33..fb73c0b4b7 100644
--- a/packages/frontend/src/scripts/aiscript/ui.ts
+++ b/packages/frontend/src/scripts/aiscript/ui.ts
@@ -303,7 +303,7 @@ function getButtonOptions(def: values.Value | undefined, call: (fn: values.VFn,
 	if (primary) utils.assertBoolean(primary);
 	const rounded = def.value.get('rounded');
 	if (rounded) utils.assertBoolean(rounded);
-	const disabled = button.value.get('disabled');
+	const disabled = def.value.get('disabled');
 	if (disabled) utils.assertBoolean(disabled);
 
 	return {