diff --git a/app/src/modules/content/routes/item.vue b/app/src/modules/content/routes/item.vue
index 0f897c6997..d63bd0fb1f 100644
--- a/app/src/modules/content/routes/item.vue
+++ b/app/src/modules/content/routes/item.vue
@@ -361,7 +361,7 @@ export default defineComponent({
 		const internalPrimaryKey = computed(() => {
 			if (isNew.value) return '+';
 
-			if (isSingleton.value) return item.value?.[primaryKeyField.value?.field];
+			if (isSingleton.value) return item.value?.[primaryKeyField.value?.field] ?? '+';
 
 			return props.primaryKey;
 		});