KomandIT on "[Plugin: Coming soon and Maintenance mode] Crash while disabling - website now doesn't work ( error 500 )"

Hi,
I was using this plugin on my website. After correcting some posts I wanted to disable maintenance mode as always but this time there was no reaction on clicking the switch and after few seconds when I wanted to open my website in new tab I saw error 500. What happened? Which files does your plugin change?

https://wordpress.org/plugins/coming-soon-page/