Add a slur by drag and drop causes a crash

Current 3.0. dev. a64198e / Windows 10

1) "Untitled" score
2) Enter two notes
3) Save/Close/Reload

- The test file at this step: slurs drag.mscz

4) From Lines palette: Add a slur on first note by drag and drop

Result: "Runtime error" -> Ok -> crash

- Or, other way (without save-reload)

1) Untitled score
2) Enter two notes
3) Exit mode input mode -> click on an empty space (because Escape doesn't works at all, a note remains highlighted despite hitting x times on this key)
So, now - after click on empty space - all is deselected:
4) From Lines palette: Add a slur by drag and drop

Result: crash

Note : from what I see right now, no issue if adding the slur by double-click (or with S shorcut)