diff --git a/passbook/providers/oauth/views/oauth2.py b/passbook/providers/oauth/views/oauth2.py
index b976eb4ea..13ffd5ae5 100644
--- a/passbook/providers/oauth/views/oauth2.py
+++ b/passbook/providers/oauth/views/oauth2.py
@@ -24,7 +24,7 @@ class PassbookAuthorizationLoadingView(LoginRequiredMixin, LoadingView):
 
     def get_url(self):
         querystring = urlencode(self.request.GET)
-        return reverse('passbook_providers_oauth:oauth2-ok-authorize')+'?'+querystring
+        return reverse('passbook_providers_oauth:oauth2-ok-authorize') + '?' + querystring
 
 
 class OAuthPermissionDenied(PermissionDeniedView):
@@ -78,7 +78,7 @@ class PassbookAuthorizationView(AccessMixin, AuthorizationView):
     def form_valid(self, form):
         # User has clicked on "Authorize"
         Event.new(EventAction.AUTHORIZE_APPLICATION,
-                  authorized_application=self._application).from_http(self.request)
+                  authorized_application=self._application.pk).from_http(self.request)
         LOGGER.debug('User authorized Application',
                      user=self.request.user, application=self._application)
         return super().form_valid(form)
diff --git a/passbook/providers/oidc/lib.py b/passbook/providers/oidc/lib.py
index 4797e8c2e..d84fe7187 100644
--- a/passbook/providers/oidc/lib.py
+++ b/passbook/providers/oidc/lib.py
@@ -9,6 +9,7 @@ from passbook.policies.engine import PolicyEngine
 
 LOGGER = get_logger()
 
+
 def check_permissions(request, user, client):
     """Check permissions, used for
     https://django-oidc-provider.readthedocs.io/en/latest/
@@ -29,6 +30,6 @@ def check_permissions(request, user, client):
         return redirect('passbook_providers_oauth:oauth2-permission-denied')
 
     Event.new(EventAction.AUTHORIZE_APPLICATION,
-              authorized_application=application,
+              authorized_application=application.pk,
               skipped_authorization=False).from_http(request)
     return None
diff --git a/passbook/providers/saml/views.py b/passbook/providers/saml/views.py
index 09cfbbd18..cc8bc1929 100644
--- a/passbook/providers/saml/views.py
+++ b/passbook/providers/saml/views.py
@@ -124,7 +124,7 @@ class LoginProcessView(AccessRequiredView):
             ctx = self.provider.processor.generate_response()
             # Log Application Authorization
             Event.new(EventAction.AUTHORIZE_APPLICATION,
-                      authorized_application=self.provider.application,
+                      authorized_application=self.provider.application.pk,
                       skipped_authorization=True).from_http(request)
             return RedirectToSPView.as_view()(
                 request=request,
@@ -144,7 +144,7 @@ class LoginProcessView(AccessRequiredView):
         if request.POST.get('ACSUrl', None):
             # User accepted request
             Event.new(EventAction.AUTHORIZE_APPLICATION,
-                      authorized_application=self.provider.application,
+                      authorized_application=self.provider.application.pk,
                       skipped_authorization=False).from_http(request)
             return RedirectToSPView.as_view()(
                 request=request,
diff --git a/passbook/sources/oauth/views/core.py b/passbook/sources/oauth/views/core.py
index 12a575c81..4e128ea49 100644
--- a/passbook/sources/oauth/views/core.py
+++ b/passbook/sources/oauth/views/core.py
@@ -181,7 +181,7 @@ class OAuthCallback(OAuthClientMixin, View):
         access.save()
         UserOAuthSourceConnection.objects.filter(pk=access.pk).update(user=user)
         Event.new(EventAction.CUSTOM, message="Linked OAuth Source",
-                  source=source).from_http(self.request)
+                  source=source.pk).from_http(self.request)
         if was_authenticated:
             messages.success(self.request, _("Successfully linked %(source)s!" % {
                 'source': self.source.name