[1.8.x] Fixed #24333 -- Fixed admin history view crash with non-integer slug.

Backport of d64baaef from master

django/contrib/admin/options.py

@@ -39,7 +39,6 @@ from django.forms.models import (
 from django.forms.widgets import CheckboxSelectMultiple, SelectMultiple
 from django.http import Http404, HttpResponseRedirect
 from django.http.response import HttpResponseBase
-from django.shortcuts import get_object_or_404
 from django.template.response import SimpleTemplateResponse, TemplateResponse
 from django.utils import six
 from django.utils.decorators import method_decorator
@@ -1750,7 +1749,12 @@ class ModelAdmin(BaseModelAdmin):
         from django.contrib.admin.models import LogEntry
         # First check if the user can see this history.
         model = self.model
-        obj = get_object_or_404(self.get_queryset(request), pk=unquote(object_id))
+        obj = self.get_object(request, unquote(object_id))
+        if obj is None:
+            raise Http404(_('%(name)s object with primary key %(key)r does not exist.') % {
+                'name': force_text(model._meta.verbose_name),
+                'key': escape(object_id),
+            })
 
         if not self.has_change_permission(request, obj):
             raise PermissionDenied

tests/admin_views/tests.py

@@ -1471,6 +1471,11 @@ class AdminViewPermissionsTest(TestCase):
 
             self.client.get(reverse('admin:logout'))
 
+    def test_history_view_bad_url(self):
+        self.client.post(reverse('admin:login'), self.changeuser_login)
+        response = self.client.get(reverse('admin:admin_views_article_history', args=('foo',)))
+        self.assertEqual(response.status_code, 404)
+
     def test_conditionally_show_add_section_link(self):
         """
         The foreign key widget should only show the "add related" button if the