From 4007764965fcfa24cd7b4c02da5a0b89b4f5000f Mon Sep 17 00:00:00 2001
From: Neil Williams <neil@reddit.com>
Date: Wed, 27 Apr 2011 15:44:53 -0700
Subject: [PATCH] Don't crash when children not viewable.

---
 r2/r2/models/_builder.pyx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/r2/r2/models/_builder.pyx b/r2/r2/models/_builder.pyx
index d00ce1762..ee406bbbe 100644
--- a/r2/r2/models/_builder.pyx
+++ b/r2/r2/models/_builder.pyx
@@ -345,7 +345,7 @@ class _MessageBuilder(Builder):
             if children:
                 # if no parent is specified, check if any of the messages are
                 # uncollapsed, and truncate the thread
-                children = [wrapped[child] for child in children]
+                children = [wrapped[child] for child in children if child in wrapped]
                 parent.child = empty_listing()
                 # if the parent is new, uncollapsed, or focal we don't
                 # want it to become a moremessages wrapper.