diff --git a/csv/load_courses.py b/csv/load_courses.py
index f70cc1f..fa8be2a 100644
--- a/csv/load_courses.py
+++ b/csv/load_courses.py
@@ -50,10 +50,10 @@ if __name__ == '__main__':
 
     for course in Course.objects.all():
         map_obj = []
-        for vertex in Vertex.objects.filter(course=course, content_type__model='topic'):
+        for vertex in Vertex.objects.filter(course=course, content_type__model='topic').order_by("object_id"):
             map_obj.append(vertex.id)
-            theme_map=[]
-            for small_vertex in vertex.children.all():
+            theme_map = []
+            for small_vertex in vertex.children.all().order_by("object_id"):
                 theme_map.append(small_vertex.id)
             map_obj.append(theme_map)