diff --git a/lib/tasks/import_issues_from_chandao.rake b/lib/tasks/import_issues_from_chandao.rake
index 15b038ce6..325b90934 100644
--- a/lib/tasks/import_issues_from_chandao.rake
+++ b/lib/tasks/import_issues_from_chandao.rake
@@ -12,7 +12,9 @@ namespace :import_from_chandao do
       author = User.like(randd_field_hash['由谁创建']).take
       issue.author_id = author&.id 
       assigner = User.like(randd_field_hash['指派给']).take 
-      issue.assigners << assigner
+      if assigner.present? 
+        issue.assigners << assigner
+      end
       issue.status_id = IssueStatus.first.id
       issue.tracker_id = Tracker.first.id
       issue.priority_id = randd_field_hash['优先级'].to_i
@@ -37,7 +39,9 @@ namespace :import_from_chandao do
       author = User.like(randd_field_hash['由谁创建']).take
       issue.author_id = author&.id 
       assigner = User.like(randd_field_hash['指派给']).take 
-      issue.assigners << assigner
+      if assigner.present? 
+        issue.assigners << assigner
+      end
       issue.status_id = IssueStatus.first.id
       issue.tracker_id = Tracker.first.id
       issue.priority_id = randd_field_hash['优先级'].to_i