diff --git a/app/models/project.rb b/app/models/project.rb
index 310d3009..d258fb0d 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -429,7 +429,7 @@ class Project < ApplicationRecord
     last_issue = self.issues.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 : 1
+    last_issue&.project_issues_index.present? ? last_issue.project_issues_index + deleted_issue_count : 1
   end
 
   def incre_project_issue_cache_delete_count