diff --git a/budget/forms.py b/budget/forms.py
index 7d8d8e1..0e95c73 100644
--- a/budget/forms.py
+++ b/budget/forms.py
@@ -117,8 +117,7 @@ class BillForm(Form):
         bill.amount=self.amount.data
         bill.what=self.what.data
         bill.date=self.date.data
-        bill.owers = [Person.query.get(ower, project) 
-                for ower in self.payed_for.data]
+        bill.owers = [Person.query.get(ower, project) for ower in self.payed_for.data]
 
         return bill
 
@@ -127,7 +126,7 @@ class BillForm(Form):
         self.amount.data = bill.amount
         self.what.data = bill.what
         self.date.data = bill.date
-        self.payed_for.data = [str(ower.id) for ower in bill.owers]
+        self.payed_for.data = [int(ower.id) for ower in bill.owers]
 
     def set_default(self):
         self.payed_for.data = self.payed_for.default
diff --git a/budget/web.py b/budget/web.py
index c5e0da2..2dc014a 100644
--- a/budget/web.py
+++ b/budget/web.py
@@ -333,7 +333,9 @@ def edit_bill(bill_id):
         flash(_("The bill has been modified"))
         return redirect(url_for('.list_bills'))
 
-    form.fill(bill)
+    if not form.errors:
+        form.fill(bill)
+
     return render_template("add_bill.html", form=form, edit=True)
 
 @main.route("/lang/<lang>")