From b3a4d915b52e524660fd5de02250288fc5be73a0 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Mon, 8 Apr 2019 00:09:00 +0100
Subject: [PATCH] Fix crash when adding subtitles.

---
 src/wx/closed_captions_dialog.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/wx/closed_captions_dialog.cc b/src/wx/closed_captions_dialog.cc
index 8e007c38f..44e6b8da1 100644
--- a/src/wx/closed_captions_dialog.cc
+++ b/src/wx/closed_captions_dialog.cc
@@ -148,10 +148,11 @@ ClosedCaptionsDialog::update (DCPTime time)
 		_current = optional<TextRingBuffers::Data>();
 	}
 
-	if (!_current) {
+	if (!_current && !_tracks.empty()) {
 		/* We have no current one: get another */
 		shared_ptr<Butler> butler = _butler.lock ();
 		DCPOMATIC_ASSERT (butler);
+		DCPOMATIC_ASSERT (_track->GetSelection() >= 0);
 		DCPOMATIC_ASSERT (_track->GetSelection() < int(_tracks.size()));
 		DCPTextTrack track = _tracks[_track->GetSelection()];
 		while (true) {
-- 
2.30.2