Plasma 5 global keyboard shortcut not working, how to debug?

Hey!

I've adapted this script from technomancy:
Code:#!/bin/bash

# This example asks the user to pick a directory from ~/music or its
# first argument and queues up its contents via mpd. http://musicpd.org

music_home=${1:-"$HOME/music/"}

# Cache directory list
list_file="$music_home/.dirs"
if [ ! -f "$list_file" ]; then
find "$music_home" -type d | cut -c $(echo $music_home | wc -c)- > "$list_file"
fi

# Ask the user
chosen=`cat $list_file | rofi -dmenu -i`

# Add it to mpd
if [ "$chosen" != "" ]; then
pidof mpd -q || mpd
mpc clear
mpc add "$chosen"
mpc play
fiand when I run it from a Konsole window it works fine. But I've created a global shortcut from the Plasma settings menu, and when I press that shortcut, the dmenu comes up and allows me to select a folder, but after that nothing happens. Do I need to observe something when creating a shortcut like that? Is there a way I can see the error the script might throw?

This is on Slackware64 15.0, up to date. mpd, mpc and rofi from SBo.