Connection to DB OK!
SELECT firstname,lastname FROM tp_customers WHERE email='papkostas@gmail.com'

Fatal error: Uncaught Error: Call to a member function fetch_assoc() on bool in /home2/mathtpallas/public_html/student/tasos/zzzttt.php:31 Stack trace: #0 {main} thrown in /home2/mathtpallas/public_html/student/tasos/zzzttt.php on line 31