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you are using ajax to load the content into the sections. what you are seeing is whatever /ajax/latest_news.php returns.

this is apparently the previous related thread - https://forums.phpfreaks.com/topic/321226-pdo-error-on-function-since-a-migration-to-pso at that time, the "Statement.php Lines 14-17" were in a file being included before the session_start() and would never have found the session variable set. i'm going to guess that the "fetch() on null error" was occurring on every page request? you have since moved these lines to statement.php. after reviewing the code you posted previously, if this problem is only occurring occasionally, it is likely due to some auto logout logic, a page auto reload occurring exactly at the point of being logged out, and a timing/race condition in the logic, due to all these session variables. at the risk or repeating myself. the only piece of user related data you should store in a session variable upon successful login is the user id (autoincrement primary index.) you should query on each page request to get any other user data, so that any changes made to this other user data take effect on the very next page request. if you cannot determine the cause of this problem, you will need to post all the current code for statemnt.php, everything being included (you should use require for things your code must have) by statement.php, everything those files are including, and index.php (and everything it includes and everything those files include) since it is involved in the redirects and could be redirecting back to statement.php, less any database credentials or sensitive site information (which should be in a configuration .php file), for anyone here to be able to help.

Now that you've confirmed the string is what you expect (I assume), you need to remove that line. Because it's getting in the way of your script outputting valid JSON.