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-rw-r--r--app/models/issue.rb6
1 files changed, 3 insertions, 3 deletions
diff --git a/app/models/issue.rb b/app/models/issue.rb
index d6d6c7c8b..e23b02647 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -1435,9 +1435,9 @@ class Issue < ActiveRecord::Base
end
def <=>(issue)
- if issue.nil?
- -1
- elsif root_id != issue.root_id
+ return nil unless issue.is_a?(Issue)
+
+ if root_id != issue.root_id
(root_id || 0) <=> (issue.root_id || 0)
else
(lft || 0) <=> (issue.lft || 0)