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 | I get the error "Warning: mysqli_close() expects parameter 1 to be mysqli, null given in" and I can't find a problem. Can anyone help, here is my code. $username = $_POST['username']; $password = $_POST['password']; $email = $_POST['email']; $CheckSQL = "SELECT * FROM users WHERE email='$email'"; $check = mysqli_fetch_array(mysqli_query($con,$CheckSQL)); if(isset($check)){ echo …  |