Website warning

Hello, I installed the TP Perfect, and today while I was changing some content the website went blanc,
and got the warning below:

Notice
: Trying to access array offset on value of type null in
/home/rondini/domains/casalerondinitoscana.com/public_html/libraries/astroid/framework/library/astroid/Element/Layout.php
on line 24

Warning
: Invalid argument supplied for foreach() in
/home/rondini/domains/casalerondinitoscana.com/public_html/libraries/astroid/framework/library/astroid/Element/Layout.php
on line 24

Can you please help me with this error?

Thank you in Advance!

Hello,
please check your menu item blog or category settings if there is a ₀ in any row or column.
0 and negative numbers are not allowed