diff --git a/netbox/utilities/forms/fields/csv.py b/netbox/utilities/forms/fields/csv.py
index 0b33a1985..1c605120f 100644
--- a/netbox/utilities/forms/fields/csv.py
+++ b/netbox/utilities/forms/fields/csv.py
@@ -120,4 +120,6 @@ class CSVMultipleContentTypeField(forms.ModelMultipleChoiceField):
                 app_label, model = name.split('.')
                 ct_filter |= Q(app_label=app_label, model=model)
             return list(ContentType.objects.filter(ct_filter).values_list('pk', flat=True))
-        return object_type_identifier(value)
+        if value:
+            return object_type_identifier(value)
+        return None