Ticket #26997: diff.txt

diff --git a/django/contrib/auth/checks.py b/django/contrib/auth/checks.py
index e7b5815..9f02304 100644
--- a/django/contrib/auth/checks.py
+++ b/django/contrib/auth/checks.py
@@ -111,7 +111,10 @@ def check_models_permissions(app_configs=None, **kwargs):
         opts = model._meta
         builtin_permissions = dict(_get_builtin_permissions(opts))
         # Check builtin permission name length.
-        max_builtin_permission_name_length = max(len(name) for name in builtin_permissions.values())
+        if builtin_permissions:
+            max_builtin_permission_name_length = max(len(name) for name in builtin_permissions.values())
+        else:
+            max_builtin_permission_name_length = 0
         if max_builtin_permission_name_length > permission_name_max_length:
             verbose_name_max_length = (
                 permission_name_max_length - (max_builtin_permission_name_length - len(opts.verbose_name_raw))
diff --git a/tests/auth_tests/test_checks.py b/tests/auth_tests/test_checks.py
index 962444f..9855870 100644
--- a/tests/auth_tests/test_checks.py
+++ b/tests/auth_tests/test_checks.py
@@ -195,3 +195,12 @@ class ModelsPermissionsChecksTests(SimpleTestCase):
                 id='auth.E008',
             ),
         ])
+
+    def test_empty_permission_name_max_length(self):
+        """should not fail on empty permissions"""
+        class Checked(models.Model):
+            class Meta:
+                permissions = ()
+                default_permissions = ()
+        errors = checks.run_checks(self.apps.get_app_configs())
+        self.assertEqual(errors, [])