diff --git a/app/models/project.rb b/app/models/project.rb
index b0133eec7..446cb89ac 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -453,7 +453,7 @@ class Project < ApplicationRecord
   end
 
   def get_last_project_issues_index
-    last_issue = self.issues.issue_issue.last
+    last_issue = self.issues.issue_issue.order(project_issues_index: :asc).last
     deleted_issue_count = ($redis_cache.hget("issue_cache_delete_count", self.id) || 0).to_i
 
     last_issue&.project_issues_index.present? ? last_issue.project_issues_index + deleted_issue_count : 0