diff --git a/odoo/addons/base/ir/ir_sequence.py b/odoo/addons/base/ir/ir_sequence.py
index 5431a33eac2..140ff7e01bd 100644
--- a/odoo/addons/base/ir/ir_sequence.py
+++ b/odoo/addons/base/ir/ir_sequence.py
@@ -96,7 +96,7 @@ class IrSequence(models.Model):
 
     def _set_number_next_actual(self):
         for seq in self:
-            seq.write({'number_next': seq.number_next_actual or 0})
+            seq.write({'number_next': seq.number_next_actual or 1})
 
     name = fields.Char(required=True)
     code = fields.Char(string='Sequence Code')
@@ -309,7 +309,7 @@ class IrSequenceDateRange(models.Model):
 
     def _set_number_next_actual(self):
         for seq in self:
-            seq.write({'number_next': seq.number_next_actual or 0})
+            seq.write({'number_next': seq.number_next_actual or 1})
 
     date_from = fields.Date(string='From', required=True)
     date_to = fields.Date(string='To', required=True)