diff --git a/ChangeLog b/ChangeLog
index 5891698433..494f56bdb6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,10 @@ Changes in version 0.1.2.18 - 2007-??-??
       connections: they specify their chosen rendezvous point by identity
       digest rather than by (potentially ambiguous) nickname. These
       changes could speed up hidden service connections dramatically.
+    - If a connection is shut down abruptly because of something that
+      happened inside connection_flushed_some(), do not call
+      connection_finished_flushing().  Should fix bug 451. Bugfix on
+      0.1.2.7-alpha.
 
   o Minor bugfixes:
     - Don't try to access (or alter) the state file when running
diff --git a/doc/TODO.012 b/doc/TODO.012
index 6126f3e966..9a03d4ba52 100644
--- a/doc/TODO.012
+++ b/doc/TODO.012
@@ -4,7 +4,7 @@ description of the patch.)
 Backport items for 0.1.2:
   o r11166: Don't believe future dates from the state file.
   o r11828+: Detect bad sa_family from accept().
-N - r11882: Avoid crash-bug 451.
+  o r11882: Avoid crash-bug 451.
 N - r11886: Consider family as well as identity when cannibalizing circuits.
 
 
diff --git a/src/or/connection.c b/src/or/connection.c
index e92345aeb3..e7c2365595 100644
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@ -2289,6 +2289,9 @@ connection_finished_flushing(connection_t *conn)
 {
   tor_assert(conn);
 
+  if (conn->s < 0 || !conn->write_event)
+    return 0;
+
 //  log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
 
   switch (conn->type) {