I wouldn’t call @linux-aarhus random person 
but the good thing in linux and esp. shell scripting is that anyone can check the code… Check-aur.sh only automates yay -Quaq…which you could have known if you read the tutorial.
https://forum.manjaro.org/t/root-tip-howto-check-if-your-aur-build-scripts-have-been-updated/
I would save you the next post and tell you this tutorial is only half the solution in your case, the other half is in other tutorial/how-tos. Or in my post above. Reading is your friend. Or Ubuntu or maybe Windows. That at least crashes without any explanation and there is nothing you can do except staring at the rolling circle, but you certainly don’t have to read much.