Handle case when project statistics is nil

app/models/project.rb

@@ -2869,7 +2869,7 @@ class Project < ApplicationRecord
   end
 
   def inactive?
-    statistics.storage_size > ::Gitlab::CurrentSettings.inactive_projects_min_size_mb.megabytes &&
+    (statistics || build_statistics).storage_size > ::Gitlab::CurrentSettings.inactive_projects_min_size_mb.megabytes &&
       last_activity_at < ::Gitlab::CurrentSettings.inactive_projects_send_warning_email_after_months.months.ago
   end
 

ee/spec/models/project_spec.rb

@@ -3357,14 +3357,14 @@ RSpec.describe Project do
 
       context 'when project belongs to free namespace' do
         let_it_be(:no_plan_group) { create(:group_with_plan, plan: nil) }
-        let_it_be(:project) { create(:project, namespace: no_plan_group) }
+        let_it_be_with_reload(:project) { create(:project, namespace: no_plan_group) }
 
         it_behaves_like 'returns true if project is inactive'
       end
     end
 
     context 'when not Gitlab.com' do
-      let_it_be(:project) { create(:project, name: 'test-project') }
+      let_it_be_with_reload(:project) { create(:project, name: 'test-project') }
 
       it_behaves_like 'returns true if project is inactive'
     end

spec/models/project_spec.rb

@@ -8179,7 +8179,7 @@ RSpec.describe Project, factory_default: :keep do
   end
 
   describe '#inactive?' do
-    let_it_be(:project) { create(:project, name: 'test-project') }
+    let_it_be_with_reload(:project) { create(:project, name: 'test-project') }
 
     it_behaves_like 'returns true if project is inactive'
   end