X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=lib%2Fthread.cc;h=e38a5b2e0abc336bd16fe03de8cb82902abd984d;hp=4411d64d98da05964318b23c0d26cc9dba7e77af;hb=387828c4356416278fdac8446c904fe4c5ad283d;hpb=933caf814fcbbb7420d03ef42bb37bea6dd90449

diff --git a/lib/thread.cc b/lib/thread.cc
index 4411d64d..e38a5b2e 100644
--- a/lib/thread.cc
+++ b/lib/thread.cc
@@ -155,7 +155,7 @@ _resolve_thread_relationships (unused (notmuch_thread_t *thread))
     while ((node = *prev)) {
 	message = node->message;
 	in_reply_to = _notmuch_message_get_in_reply_to (message);
-	if (in_reply_to &&
+	if (in_reply_to && strlen (in_reply_to) &&
 	    g_hash_table_lookup_extended (thread->message_hash,
 					  in_reply_to, NULL,
 					  (void **) &parent))