diff --git a/apps/wpmw/views.py b/apps/wpmw/views.py
index f02ad8b4..c23e733d 100644
--- a/apps/wpmw/views.py
+++ b/apps/wpmw/views.py
@@ -76,12 +76,12 @@ class WprViewSet(CustomListModelMixin, RetrieveModelMixin, ComplexQueryMixin, Cu
                 mioitem__mio__submit_time__isnull=False, 
                 number_out__isnull=False, number_out__startswith=prefix).order_by("number_out").last()
             if mioitemw_last:
-                number_outs.extend(mioitemw_last.number_out)
+                number_outs.append(mioitemw_last.number_out)
         if number_outs:
             number_outs.sort()
             number_out_last = number_outs[-1]
             number_int_last = number_out_last.lstrip(prefix).lstrip('0')
-            return Response({"number_out_last": number_out_last, "number_out_int_last": number_int_last})
+            return Response({"number_out_last": number_out_last, "number_out_int_last": int(number_int_last)})
         else:
             return Response({"number_out_last": None})