diff --git a/app/api/views/project.py b/app/api/views/project.py
index 4c8333e1..da5a1b62 100644
--- a/app/api/views/project.py
+++ b/app/api/views/project.py
@@ -21,11 +21,16 @@ class ProjectList(generics.ListCreateAPIView):
 
     def delete(self, request, *args, **kwargs):
         delete_ids = request.data['ids']
-        Project.objects.filter(
+        projects = Project.objects.filter(
             role_mappings__user=self.request.user,
             role_mappings__role__name=settings.ROLE_PROJECT_ADMIN,
             pk__in=delete_ids
-        ).delete()
+        )
+        # Todo: I want to use bulk delete.
+        # But it causes the constraint error.
+        # See https://github.com/django-polymorphic/django-polymorphic/issues/229
+        for project in projects:
+            project.delete()
         return Response(status=status.HTTP_204_NO_CONTENT)
 
 
diff --git a/frontend/components/project/FormCreate.vue b/frontend/components/project/FormCreate.vue
index e9d6563d..9e6a3e3e 100644
--- a/frontend/components/project/FormCreate.vue
+++ b/frontend/components/project/FormCreate.vue
@@ -97,6 +97,7 @@ export default Vue.extend({
 
   methods: {
     translateTypeName(type: string, types: string[]): string {
+      // @ts-ignore
       const index = this.projectTypes.indexOf(type)
       return types[index]
     }