Trying to extend brackets downwards lets musescore die

I'm running /home/backes/Appimages/MuseScoreNightly-201711270858-master-e212f7d-x86_64.AppImage. If I try ro extend some bracket in multiline score downwards, mscore dies.

Verifying:

Create a new score (for example using grand staff), remove the curly bracket, add a bracket to the first stave, select the bracket and try to extend it downwards -> mscore dies:

/tmp/.mount_b2sATA/AppRun: line 18: 8664 Segmentation fault (core dumped) "${APPDIR}/bin/mscore-portable-nightly" "$@"