From b33437685e43427459e7ea752f3cd3d621878573 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Fri, 22 Nov 2019 21:04:05 +0100
Subject: [PATCH] Add assert.

---
 src/wx/film_viewer.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/wx/film_viewer.cc b/src/wx/film_viewer.cc
index f921f83bd..17573b438 100644
--- a/src/wx/film_viewer.cc
+++ b/src/wx/film_viewer.cc
@@ -286,6 +286,7 @@ FilmViewer::suspend ()
 void
 FilmViewer::resume ()
 {
+	DCPOMATIC_ASSERT (_suspended > 0);
 	--_suspended;
 	if (_playing && !_suspended) {
 		if (_audio.isStreamOpen()) {
-- 
2.30.2