good afternoon. I am developing a system that edits rows of a mysql database. The system I'm doing in PHP and JS (native). Ajax requests to a php and nothing else. The data of the BBDD shows them to me perfectly. The issue is when editing certain records. That is, I have an option 'Edit name' and for example, if I change the name to a record, the system works but no changes are made to the database.
I check the chrome console, and every time I press f5 and restart the page I get the following error.
That is, without making any movement, the error appears as soon as I restart the page.
If someone knows the solution and can comment on it ... thank you very much in advance!