diff --git a/compensation/utils/quality.py b/compensation/utils/quality.py
index f883ba36..193cf9a2 100644
--- a/compensation/utils/quality.py
+++ b/compensation/utils/quality.py
@@ -30,7 +30,10 @@ class CompensationQualityChecker(AbstractQualityChecker):
         """
         after_states = self.obj.get_surface_after_states()
         before_states = self.obj.get_surface_before_states()
-        if after_states != before_states:
+        sum_after_states_surface = self.obj.get_surface_after_states()
+        sum_before_states_surface = self.obj.get_surface_before_states()
+
+        if sum_after_states_surface != sum_before_states_surface:
             self.messages.append(
                 _("States unequal")
             )