diff --git a/apps/wf/serializers.py b/apps/wf/serializers.py
index 58e4b8d9..a81e7361 100755
--- a/apps/wf/serializers.py
+++ b/apps/wf/serializers.py
@@ -94,7 +94,7 @@ class TicketSimpleSerializer(CustomModelSerializer):
 
 
 class TicketCreateSerializer(CustomModelSerializer):
-    transition = serializers.PrimaryKeyRelatedField(queryset=Transition.objects.all(), write_only=True)
+    transition = serializers.PrimaryKeyRelatedField(queryset=Transition.objects.all(), write_only=True, allow_null=True)
     title = serializers.CharField(allow_blank=True, required=False)
 
     class Meta: