Possible bug when accessing backup scheduler grav v1.6.0-rc.4

I hope this is the right place to submit this possible bug report. I clicked on the scheduler tab in the Backups Manager and got this "Crikey" message:

TypeError

Return value of Symfony\Component\Process\Process::close() must be of the type integer, null returned

Hi @ozbod, could you please post this issue (with further details if possible) for the Admin Panel at https://github.com/getgrav/grav-plugin-admin/issues

Thanks very much,
Paul

Will do Paul thanks for your guidance, just off to the evening job right now so will do it in the morning

Thanks very much @ozbod!