From 8a1232524bc31df96a019e5d31cf440703fb8d1a Mon Sep 17 00:00:00 2001
From: Marc Sabatella <marc@outsideshore.com>
Date: Sun, 3 Jan 2016 12:40:36 -0700
Subject: [PATCH] fix #92626: corruption when removing all existing staves and
 adding new ones

---
 libmscore/measure.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libmscore/measure.cpp b/libmscore/measure.cpp
index 822304a7555d..edbb60908f65 100644
--- a/libmscore/measure.cpp
+++ b/libmscore/measure.cpp
@@ -1135,12 +1135,19 @@ void Measure::cmdAddStaves(int sStaff, int eStaff, bool createRest)
             // replicate time signature
             if (ts) {
                   TimeSig* ots = 0;
+                  bool constructed = false;
                   for (int track = 0; track < staves.size() * VOICES; ++track) {
                         if (ts->element(track)) {
                               ots = static_cast<TimeSig*>(ts->element(track));
                               break;
                               }
                         }
+                  if (!ots) {
+                        // no time signature found; use measure length to construct one
+                        ots = new TimeSig(score());
+                        ots->setSig(len());
+                        constructed = true;
+                        }
                   // do no replicate local time signatures
                   if (ots && !ots->isLocal()) {
                         TimeSig* timesig = new TimeSig(*ots);
@@ -1149,6 +1156,8 @@ void Measure::cmdAddStaves(int sStaff, int eStaff, bool createRest)
                         timesig->setSig(ots->sig(), ots->timeSigType());
                         timesig->setNeedLayout(true);
                         score()->undoAddElement(timesig);
+                        if (constructed)
+                              delete ots;
                         }
                   }
             }