diff --git a/rhodecode/controllers/admin/repos_groups.py b/rhodecode/controllers/admin/repos_groups.py
--- a/rhodecode/controllers/admin/repos_groups.py
+++ b/rhodecode/controllers/admin/repos_groups.py
@@ -75,7 +75,7 @@ class ReposGroupsController(BaseControll
         """
         self.__load_defaults()
 
-        repo_group = RepoGroup.get(group_id)
+        repo_group = RepoGroup.get_or_404(group_id)
 
         data = repo_group.get_dict()
 
@@ -277,12 +277,9 @@ class ReposGroupsController(BaseControll
         """GET /repos_groups/id: Show a specific item"""
         # url('repos_group', id=ID)
 
-        c.group = RepoGroup.get(id)
+        c.group = RepoGroup.get_or_404(id)
 
-        if c.group:
-            c.group_repos = c.group.repositories.all()
-        else:
-            return redirect(url('home'))
+        c.group_repos = c.group.repositories.all()
 
         #overwrite our cached list with current filter
         gr_filter = c.group_repos
diff --git a/rhodecode/controllers/admin/users.py b/rhodecode/controllers/admin/users.py
--- a/rhodecode/controllers/admin/users.py
+++ b/rhodecode/controllers/admin/users.py
@@ -172,9 +172,8 @@ class UsersController(BaseController):
     def edit(self, id, format='html'):
         """GET /users/id/edit: Form to edit an existing item"""
         # url('edit_user', id=ID)
-        c.user = User.get(id)
-        if not c.user:
-            return redirect(url('users'))
+        c.user = User.get_or_404(id)
+
         if c.user.username == 'default':
             h.flash(_("You can't edit this user"), category='warning')
             return redirect(url('users'))
diff --git a/rhodecode/controllers/pullrequests.py b/rhodecode/controllers/pullrequests.py
--- a/rhodecode/controllers/pullrequests.py
+++ b/rhodecode/controllers/pullrequests.py
@@ -198,11 +198,8 @@ class PullrequestsController(BaseRepoCon
         repo_model = RepoModel()
         c.users_array = repo_model.get_users_js()
         c.users_groups_array = repo_model.get_users_groups_js()
-        c.pull_request = PullRequest.get(pull_request_id)
+        c.pull_request = PullRequest.get_or_404(pull_request_id)
 
-        # valid ID
-        if not c.pull_request:
-            raise HTTPNotFound
         cc_model = ChangesetCommentsModel()
         cs_model = ChangesetStatusModel()
         _cs_statuses = cs_model.get_statuses(c.pull_request.org_repo,
diff --git a/rhodecode/model/db.py b/rhodecode/model/db.py
--- a/rhodecode/model/db.py
+++ b/rhodecode/model/db.py
@@ -35,6 +35,7 @@ from sqlalchemy.ext.hybrid import hybrid
 from sqlalchemy.orm import relationship, joinedload, class_mapper, validates
 from sqlalchemy.exc import DatabaseError
 from beaker.cache import cache_region, region_invalidate
+from webob.exc import HTTPNotFound
 
 from pylons.i18n.translation import lazy_ugettext as _
 
@@ -51,6 +52,7 @@ from rhodecode.lib.caching_query import 
 from rhodecode.model.meta import Base, Session
 
 
+
 URL_SEP = '/'
 log = logging.getLogger(__name__)
 
@@ -142,6 +144,14 @@ class BaseModel(object):
             return cls.query().get(id_)
 
     @classmethod
+    def get_or_404(cls, id_):
+        if id_:
+            res = cls.query().get(id_)
+            if not res:
+                raise HTTPNotFound
+            return res
+
+    @classmethod
     def getAll(cls):
         return cls.query().all()