Crash when extending note into "let ring" and "Palm Mute"

Same result for the Palm Mute line (P.M.) - from memory, these two lines were implemented together.
Test file: ring palm.mscz
Select the first note and increase its value (dotted quarter note, e.g.), leads to the crash.

Yes. very serious indeed. Have you tried the latest development build?

Latest development version crashes too.

Stack trace:
1 Ms::LetRing::linePos letring.cpp 227 0x835bfc
2 Ms::SLine::layoutSystem line.cpp 776 0x7fcf0b
3 Ms::processLines layout.cpp 3228 0x7ee05a
4 Ms::Score::layoutSystemElements layout.cpp 3930 0x7f2b0c
5 Ms::Score::collectSystem layout.cpp 3576 0x7efc81
6 Ms::LayoutContext::collectPage layout.cpp 4198 0x7f449e
7 Ms::LayoutContext::layout layout.cpp 4511 0x7f60fe
8 Ms::Score::doLayoutRange layout.cpp 4499 0x7f6061
9 Ms::Score::update cmd.cpp 302 0x919236
10 Ms::Score::endCmd cmd.cpp 260 0x918ed6
11 Ms::Score::cmd cmd.cpp 4137 0x92d160
12 Ms::ScoreView::cmd scoreview.cpp 2562 0x6044d1
13 Ms::ScoreView::cmd scoreview.cpp 1823 0x5fc95f
14 Ms::MuseScore::cmd musescore.cpp 6485 0x431c0b
15 Ms::MuseScore::cmd musescore.cpp 5923 0x42e6cd
16 Ms::MuseScore::qt_static_metacall moc_musescore.cpp 513 0x5b83b7
17 QMetaObject::activate(QObject *, int, int, void * *) 0x68a947c8
18 Ms::ScoreTab::actionTriggered moc_scoretab.cpp 225 0x5d54e6
19 Ms::ScoreTab::qt_static_metacall moc_scoretab.cpp 110 0x5d4f6e
20 QMetaObject::activate(QObject *, int, int, void * *) 0x68a947c8
...

Palm mute and let ring crash at different places, but indeed both use the same code at that spot

Band aid:

$ git diff
diff --git a/libmscore/letring.cpp b/libmscore/letring.cpp
index c03c108c5..d69ecd2cb 100644
--- a/libmscore/letring.cpp
+++ b/libmscore/letring.cpp
@@ -224,6 +224,8 @@ QPointF LetRing::linePos(Grip grip, System** sys) const
       System* s = nullptr;
       if (grip == Grip::START) {
             ChordRest* c = toChordRest(startElement());
+            if (!c)
+                  return QPointF();
             s = c->segment()->system();
             x = c->pos().x() + c->segment()->pos().x() + c->segment()->measure()->pos().x();
             if (c->isRest() && c->durationType() == TDuration::DurationType::V_MEASURE)
diff --git a/libmscore/palmmute.cpp b/libmscore/palmmute.cpp
index cedeef1c3..70c7b8a70 100644
--- a/libmscore/palmmute.cpp
+++ b/libmscore/palmmute.cpp
@@ -208,6 +208,8 @@ QPointF PalmMute::linePos(Grip grip, System** sys) const
       System* s = nullptr;
       if (grip == Grip::START) {
             ChordRest* c = toChordRest(startElement());
+            if (!c)
+                  return QPointF();
             s = c->segment()->system();
             x = c->pos().x() + c->segment()->pos().x() + c->segment()->measure()->pos().x();
             if (c->isRest() && c->durationType() == TDuration::DurationType::V_MEASURE)

Prevents the crash, but these lines look different after, they now start on the left border:

OTH not sure what else to expect? The behavior of ottava-, pedal-, trill-, (de)crescendo-, text lines or hairpins is different but not really any better

See https://github.com/musescore/MuseScore/pull/5926 (using the above mentioned 'band aid')

Fixed in branch master, commit f8a0429c50

fix #303712: Crash when extending note into "let ring" and "Palm Mute"

Fixed in branch master, commit 09129552aa

_Merge pull request #5926 from Jojo-Schmitz/let-ring-palm-mute-crash

fix #303712: Crash when extending note into "let ring" and "Palm Mute"_

Automatically closed -- issue fixed for 2 weeks with no activity.