From 7c8552620eb0024c56848b9f28742e9f9038dc28 Mon Sep 17 00:00:00 2001
From: Dmitri Ovodok <dmitrio95@yandex.ru>
Date: Mon, 17 Dec 2018 10:11:50 +0200
Subject: [PATCH] fix #279761: add a missing list emptiness check

---
 libmscore/range.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libmscore/range.cpp b/libmscore/range.cpp
index a71311c62a79..cc401c2dbf12 100644
--- a/libmscore/range.cpp
+++ b/libmscore/range.cpp
@@ -172,7 +172,7 @@ void TrackList::append(Element* e)
                                           break;
                                           }
                                    }
-                              if (akkumulateChord && back()->isChord()) {
+                              if (akkumulateChord && !empty() && back()->isChord()) {
                                     Chord* bc   = toChord(back());
                                     Fraction du = bc->duration();
                                     du += bc->duration();