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Actually, now I ran on my linux and am not sure that this bug is due to timeline because I don't see timeline in the stack trace...maybe there was something wrong with gsco_nikos' crash reporter.
@JoshuaBonn1, see: https://musescore.org/en/node/246146#comment-770686
You should focus on fixing that right now, cause crashes are almost always most important priority. Crash is in timeline.cpp:1296