diff --git a/src/stores/projects.ts b/src/stores/projects.ts
index 3f509a4f9..4c9874da6 100644
--- a/src/stores/projects.ts
+++ b/src/stores/projects.ts
@@ -244,7 +244,7 @@ export function useProject(projectId: MaybeRef<IProject['id']>) {
 	
 	async function duplicateProject(parentProjectId: IProject['id']) {
 		const projectDuplicate = new ProjectDuplicateModel({
-			projectId: unref(projectId),
+			projectId: Number(unref(projectId)),
 			parentProjectId,
 		})
 
diff --git a/src/views/project/settings/duplicate.vue b/src/views/project/settings/duplicate.vue
index d66bbfa29..8da9ba5d8 100644
--- a/src/views/project/settings/duplicate.vue
+++ b/src/views/project/settings/duplicate.vue
@@ -42,7 +42,7 @@ watch(
 )
 
 async function duplicate() {
-	await duplicateProject(parentProject.value.id)
+	await duplicateProject(parentProject.value?.id ?? 0)
 	success({message: t('project.duplicate.success')})
 }
 </script>