From 58d101e75b419725e8cab6a76538d32b00f2c87a Mon Sep 17 00:00:00 2001
From: spez <steve@reddit.com>
Date: Fri, 31 Jul 2009 13:56:55 -0700
Subject: [PATCH] fix a bug where adding a comment to a comment tree that isn't
 cached creates a broken comment page.

---
 r2/r2/lib/comment_tree.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/r2/r2/lib/comment_tree.py b/r2/r2/lib/comment_tree.py
index a5dfa6fa8..27a5fa720 100644
--- a/r2/r2/lib/comment_tree.py
+++ b/r2/r2/lib/comment_tree.py
@@ -42,6 +42,11 @@ def add_comment_nolock(comment):
 
     cids, comment_tree, depth, num_children = link_comments(link_id)
 
+    #make sure we haven't already done this before (which would happen
+    #if the tree isn't cached when you add a comment)
+    if comment._id in cids:
+        return
+
     #add to comment list
     cids.append(comment._id)