diff --git a/finance/models.py b/finance/models.py
index 98d749c..5849def 100755
--- a/finance/models.py
+++ b/finance/models.py
@@ -94,7 +94,7 @@ class InvoiceRebilling(Invoice):
     rebilling_on = models.BooleanField(verbose_name='Повторять платеж', default=False, editable=False)
 
     def create_child_pays(self, count):
-        for idx in range(count-1):
+        for idx in range(int(count)-1):
             InvoiceRebilling.objects.create(
                 bill=self.bill,
                 comment=self.comment,