diff --git a/pyalchemybiz/controllers/customer.py b/pyalchemybiz/controllers/customer.py
index bc6f059..5e779bf 100644
--- a/pyalchemybiz/controllers/customer.py
+++ b/pyalchemybiz/controllers/customer.py
@@ -24,8 +24,12 @@ class CustomerController(BaseController):
         """
         Display a customer's details.
         """
+        if id is None:
+            abort(404)
         cust_q = meta.Session.query(customer.Customer)
         c.customer = cust_q.get(int(id))
+        if c.customer is None:
+            abort(404)
         return render('/derived/customer/view.mako')
 
     def new(self):
@@ -52,7 +56,7 @@ class CustomerController(BaseController):
         meta.Session.delete(cust)
         meta.Session.commit()
 
-        redirect_to(action='list')
+        redirect_to(action='list', id=None)
 
     def create(self):
         """
@@ -67,7 +71,7 @@ class CustomerController(BaseController):
         meta.Session.add(cust.person)
         meta.Session.commit()
 
-        redirect_to(action='list')
+        redirect_to(action='list', id=None)
 
     def save(self, id):
         """
@@ -81,4 +85,4 @@ class CustomerController(BaseController):
         meta.Session.add(cust.person)
         meta.Session.commit()
 
-        redirect_to(action='list')
+        redirect_to(action='list', id=None)