From a5a1946bdbb7e4ede546bd8be2210d383ac362e6 Mon Sep 17 00:00:00 2001
From: Dmitri Ovodok <dmitrio95@yandex.ru>
Date: Sat, 22 Dec 2018 12:48:32 +0200
Subject: [PATCH] fix #280442: fix a crash on hiding all staves if there are
 system elements

---
 libmscore/element.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libmscore/element.cpp b/libmscore/element.cpp
index b17845bbf3ff..7752206f6f70 100644
--- a/libmscore/element.cpp
+++ b/libmscore/element.cpp
@@ -2139,7 +2139,13 @@ void Element::autoplaceSegmentElement(qreal minDistance)
       if (visible() && autoplace() && parent()) {
             Segment* s = toSegment(parent());
             Measure* m = s->measure();
-            int si     = systemFlag() ? m->system()->firstVisibleStaff() : staffIdx();
+
+            int si = staffIdx();
+            if (systemFlag()) {
+                  const int firstVis = m->system()->firstVisibleStaff();
+                  if (firstVis < score()->nstaves())
+                        si = firstVis;
+                  }
 
             SysStaff* ss = m->system()->staff(si);
             QRectF r = bbox().translated(m->pos() + s->pos() + pos());