diff --git a/app/models/journal.rb b/app/models/journal.rb
index 894b62da9..e41018514 100644
--- a/app/models/journal.rb
+++ b/app/models/journal.rb
@@ -148,12 +148,12 @@ class Journal < ApplicationRecord
           new_issue = Issue.find_by_id(detail.value)
           old_value = ""
           new_value = ""
-          if old_issue.enterprise_identifier.nil? 
+          if old_issue&.enterprise_identifier.nil? 
             old_value = "<b><#{old_issue&.subject}></b>"
           else
             old_value = "<a href=\"#{EduSetting.get("pms_server_url")}/#{old_issue&.enterprise_identifier}/projects/#{old_issue&.pm_project_id}/demand/#{old_issue&.id}\"><b><#{old_issue&.subject}></b></a>"
           end
-          if new_issue.enterprise_identifier.nil?
+          if new_issue&.enterprise_identifier.nil?
             new_value = "<b><#{new_issue&.subject}></b>"
           else
             new_value = "<a href=\"#{EduSetting.get("pms_server_url")}/#{new_issue&.enterprise_identifier}/projects/#{new_issue&.pm_project_id}/demand/#{new_issue&.id}\"><b><#{new_issue&.subject}></b></a>"