diff --git a/models/pos_session.py b/models/pos_session.py
index 29de5be..f2f44df 100755
--- a/models/pos_session.py
+++ b/models/pos_session.py
@@ -61,7 +61,10 @@ class PosSession(models.Model):
     def _compute_cash_difference(self):
         for session in self:
             if session.state == "closed":
-                session.cash_difference = session.closing_cash_difference or 0.0
+                if session.closing_cash_difference:
+                    session.cash_difference = session.closing_cash_difference
+                else:
+                    session.cash_difference = session.cash_register_difference or 0.0
             else:
                 session.cash_difference = session.cash_register_difference or 0.0