diff --git a/service/views.py b/service/views.py
index 163f55a..257b87c 100644
--- a/service/views.py
+++ b/service/views.py
@@ -132,8 +132,9 @@ class PlacementPointViewSet(ReadOnlyModelViewSet):
     def search_address(self, request):
         address = self.request.GET.get('address')
         qs = self.get_queryset()
-        qs = qs.filter(address__icontains=address)
-
+        if address:
+            qs = qs.filter(address__icontains=address)
+        qs = qs.distinct()
         page = self.paginate_queryset(qs)
         if page is not None:
             serializer = self.get_serializer(page, many=True)