diff --git a/test_server/crm/views.py b/test_server/crm/views.py
index 8e02da2..a7abf9c 100644
--- a/test_server/crm/views.py
+++ b/test_server/crm/views.py
@@ -244,6 +244,18 @@ class ConsumerViewSet(ModelViewSet):
         path = export_consumer(serializer.data)
         return Response({'path': path})
 
+    @action(methods=['get'], detail=True, url_name='consumer_unbind', perms_map=[{'*':'consumer_unbind'}])
+    def unbind(self, request, *args, **kwargs):
+        obj = self.get_object()
+        if obj.username and obj.openid:
+            obj.openid = None
+            obj.nickname = None
+            obj.avatar = None
+            obj.save()
+            return Response(status=status.HTTP_200_OK)
+        else:
+            return Response({"error":"不支持解绑!"})
+
 class ConsumerMPLoginView(APIView):
     """
     小程序登陆颁发token
diff --git a/test_server/examtest/views.py b/test_server/examtest/views.py
index 7b7949f..704c924 100644
--- a/test_server/examtest/views.py
+++ b/test_server/examtest/views.py
@@ -246,7 +246,7 @@ class ExamTestViewSet(ModelViewSet):
         queryset = ExamTest.objects.filter(consumer=request.user)
         ret = {}
         ret['total'] = queryset.count()
-        ret['avg_score'] = round(queryset.aggregate(avg=Avg('score'))['avg'])
+        ret['avg_score'] = round(queryset.aggregate(avg=Avg('score'))['avg']) if ret['total'] else 0
         ret['pass_rate'] = round(((queryset.filter(is_pass=True).count())/ret['total'])*100) if ret['total'] else 0
         return Response(ret)