lib/message: catch exception in n_m_get_thread_id

This allows us to return an error value from the library.

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/message.cc b/lib/message.cc
index b7a64b1c..3ca7b902 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -604,7 +604,12 @@ _notmuch_message_get_in_reply_to (notmuch_message_t *message)
 const char *
 notmuch_message_get_thread_id (notmuch_message_t *message)
 {
-    _notmuch_message_ensure_metadata (message, message->thread_id);
+    try {
+	_notmuch_message_ensure_metadata (message, message->thread_id);
+    } catch (Xapian::Error &error) {
+	LOG_XAPIAN_EXCEPTION (message, error);
+	return NULL;
+    }
     if (! message->thread_id)
 	INTERNAL_ERROR ("Message with document ID of %u has no thread ID.\n",
 			message->doc_id);