Musescore crashes when trying to open a specifc score

Fatal error: line 2 column 26 No definition for element museScore available. :(

I can confirm the crash. Needs investigation in a development/debug build.

Stack trace:
1 Ms::Element::parent element.h 188 0xe2d8ac
2 Ms::Segment::measure segment.h 129 0xe2eb5f
3 Ms::Segment::tick segment.cpp 218 0x92855b
4 Ms::LyricsLine::layout lyricsline.cpp 156 0xa663a6
5 Ms::LyricsLine::layoutSystem lyricsline.cpp 182 0xa66669
6 Ms::Score::layoutSystemElements layout.cpp 3948 0x8ba68c
7 Ms::Score::collectSystem layout.cpp 3564 0x8b78ae
8 Ms::LayoutContext::collectPage layout.cpp 4186 0x8bba87
9 Ms::LayoutContext::layout layout.cpp 4506 0x8bd7a1
10 Ms::Score::doLayoutRange layout.cpp 4494 0x8bd6ff
11 Ms::Score::update cmd.cpp 302 0x9c6562
12 Ms::Score::update score.h 726 0xd4e9ea
13 Ms::readScore file.cpp 2356 0x6543e7
14 Ms::MuseScore::readScore file.cpp 349 0x6428be
15 Ms::MuseScore::openScore file.cpp 327 0x642784
16 Ms::MuseScore::loadFiles file.cpp 304 0x642432
17 Ms::MuseScore::cmd musescore.cpp 6089 0x500e48
18 Ms::MuseScore::cmd musescore.cpp 5887 0x4fffd1
19 Ms::MuseScore::qt_static_metacall moc_musescore.cpp 867 0x41067f
20 ZN11QMetaObject8activateEP7QObjectiiPPv 0x68c82e55
...

Changing the code to prevent the crash (not sure at all whether that'd be the right fix though)

diff --git a/libmscore/lyricsline.cpp b/libmscore/lyricsline.cpp
index 2884e98a0..6386c0a1c 100644
--- a/libmscore/lyricsline.cpp
+++ b/libmscore/lyricsline.cpp
@@ -153,6 +153,8 @@ void LyricsLine::layout()
                   }
             // Spanner::computeEndElement() will actually ignore this value and use the (earlier) lyrics()->endTick() instead
             // still, for consistency with other lines, we should set the ticks for this to the computed (later) value
-            setTicks(s->tick() - lyricsStartTick);
+            if (s)
+                  setTicks(s->tick() - lyricsStartTick);
             }
       else {                                    // dash(es)

results in the score to get loaded but reporting a bunch of corruptions:

Measure 5, Staff 1 incomplete. Expected: 4/4; Found: 10/8
Measure 6, Staff 1 incomplete. Expected: 4/4; Found: 9/8
Measure 9, Staff 1 incomplete. Expected: 4/4; Found: 19/16
Measure 18, Staff 1 incomplete. Expected: 4/4; Found: 19/16
Measure 19, Staff 1 incomplete. Expected: 4/4; Found: 23/16
Measure 21, Staff 1 incomplete. Expected: 4/4; Found: 19/16
Measure 22, Staff 1 incomplete. Expected: 4/4; Found: 19/16
Measure 26, Staff 1 incomplete. Expected: 4/4; Found: 10/8

While looking at it more closely it crashed (most likely at autosave, probably due to a corrupt part, likely Tenor) on a failed assertion:
Fatal: ASSERT: "first()" in file ...\libmscore\measure.cpp, line 1924 (...\libmscore\measure.cpp:1924, )

I'm pretty sure that score started its live in MuseScore 1
Some more changes to make it taking all MuseScore 3 defaults. But still with those corruptions...