diff --git a/scripts/parsers/detection/detection_object.py b/scripts/parsers/detection/detection_object.py
index cfe7393..3c8bb6d 100644
--- a/scripts/parsers/detection/detection_object.py
+++ b/scripts/parsers/detection/detection_object.py
@@ -230,7 +230,9 @@ def merge(self, object_to_merge, class_name=None):
         # Merge polygons
         frist_polygon = self.get_polygon()
         second_polygon = object_to_merge.get_polygon()
-        union_polygon = cascaded_union([frist_polygon, second_polygon])
+        frist_polygon_buf = frist_polygon.buffer(0)
+        second_polygon_buf = second_polygon.buffer(0)
+        union_polygon = cascaded_union([frist_polygon_buf, second_polygon_buf])
 
         self.set_class_name(self.__class_name)
         self.set_metadata(self.__metadata)