diff --git a/apps/wf/serializers.py b/apps/wf/serializers.py
index 12f408a3..f2221234 100755
--- a/apps/wf/serializers.py
+++ b/apps/wf/serializers.py
@@ -122,7 +122,8 @@ class TicketListSerializer(CustomModelSerializer):
 
     def get_participant_(self, obj):
         if obj.participant_type in [1, 2]:
-            return UserSimpleSerializer(instance=User.objects.filter(id__in=obj.participant), many=True).data
+            instance = User.objects.filter(id__in=obj.participant) | User.objects.filter(id=obj.participant)
+            return UserSimpleSerializer(instance=instance, many=True).data
         return None
 
     @staticmethod
@@ -143,7 +144,8 @@ class TicketDetailSerializer(CustomModelSerializer):
 
     def get_participant_(self, obj):
         if obj.participant_type in [1, 2]:
-            return UserSimpleSerializer(instance=User.objects.filter(id__in=obj.participant), many=True).data
+            instance = User.objects.filter(id__in=obj.participant) | User.objects.filter(id=obj.participant)
+            return UserSimpleSerializer(instance=instance, many=True).data
         return None
 
     @staticmethod