Crash undoing resize of mix

Got a crash when undoing a resize of a mix. full-log.txt.

// ADJUSTING EFFECT LENGTH, LOGUNDO  true ,  0 / 0 - 12 ,  13
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// ADJUSTING EFFECT LENGTH, LOGUNDO  true ,  0 / 0 - 4 ,  5
ASSERT: "m_snaps.count(position) > 0" in file /home/farid/kdenlive/src/timeline2/model/snapmodel.cpp, line 26

When recovering the project and trying to delete the mix or moving a clip away from another I also get a crash with only this info: log-2.txt

 = = SET EFFECT PARAM:  "rect"  =  0=-7097 -7325 21651 12178 1.000000
ASSERT: "!m_playlists[sourcePlaylist].is_blank_at(position) && m_playlists[destPlaylist].is_blank_at(position)" in file /home/farid/kdenlive/src/timeline2/model/trackmodel.cpp, line 127