Why does a helper error occur in Codeigniter 3?

Question

CodeIgniter

Hello everyone, I extended the form validation helper, I use it on almost the entire site and sometimes it happens that I go to the page, and I have an error

But as soon as I update the page, that's it, it disappears and everything returns to normal, that's it may be??

Answer 1

Because there is no title_ru index. Yet it is written

Answer 2

It can be seen title_ru is taken from the session. Check for isset, and if there is no value, then set some default.