Scrolling crash

[xynxynxyn]

When one scrolls down a playlist and then moves up more units then there are songs above the current position sconsify closes with this message:
goroutine 10 [running]: panic(0x7df6c0, 0xc42044c1c0) /usr/local/go/src/runtime/panic.go:500 +0x1a1 log.Panicln(0xc42065af68, 0x1, 0x1) /usr/local/go/src/log/log.go:334 +0xc9 github.com/fabiofalci/sconsify/ui/simple.(*Gui).startGui(0xc42013e0f0) /go/src/github.com/fabiofalci/sconsify/ui/simple/cui.go:197 +0x294 created by github.com/fabiofalci/sconsify/ui/simple.(*ConsoleUserInterface).NewPlaylists /go/src/github.com/fabiofalci/sconsify/ui/simple/cui.go:114 +0xa9