Two functions on one button in Gpio buttons

[Romanz]

The system boots up, the display appears on the oled display. If I go to terminal and enter the command "sudo systemctl stop mpd_oled" the display goes out. If I type "sudo systemctl start mpd_oled" at once, the display appears. If I press the button and run the script, the display goes out. The next press does not help. If I type the command "sudo systemctl start mpd_oled" in the terminal, there is no response either. Only rebooting moode helps.