FWIW, my non-avx system doesn't reproduce the crash:

        #. 0$0
    0
        9!:14''
    j901/j64/linux/release/GPL3/voidlinux.org/2019-12-15T23:11:06

Ben Gorte <bgo...@gmail.com> wrote:

> Hi J,
>
> Base 2 on an empty array gives 0 , which I guess makes sense:
>     #.  ''  NB. array with no characters
> 0
>     #. 0$12 NB. no integers
> 0
>     #. 0$0 NB. no booleans
>
> ... the last one crashes my jqt-session however - as does for example:
>
>    #. 3 }. 1 0 1
>
> JVERSION
>
> Engine: j901/j64avx2/linux
>
> Release-a: commercial/2019-12-12T12:44:48
>
> Library: 9.01.16
>
> Qt IDE: 1.8.1/5.5.1
>
> Platform: Linux 64
>
> Installer: J901 install
>
> InstallPath: /home/ben/j901
>
> Contact: www.jsoftware.com
>
>
> It was ok in J807.
>
>
> Workaround is simple:
>
>
> 2&#. 0$0
>
> 0
>
>
>
>
> Grtz
>
> Ben
> ----------------------------------------------------------------------
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