MySQL语法错误错误

当调用我的函数时，会出现MySQL语法错误，有什么想法吗？

您的SQL语法有错误；查看与MySQL服务器版本相对应的手册，了解在第1行"附近使用的正确语法

function getComments1() {
    $query = mysql_query("SELECT * FROM comments") or die(mysql_error());
    while($post = mysql_fetch_assoc($query)) {
        echo $post['Author'];
    }
}
function addComment($cName, $cContent) {
    $query = mysql_query("INSERT INTO comments VALUES(null,'$cName','$cContent'") or die(mysql_error());
}

<?php
include('includes/functions.php');
mysql_set_charset ( "utf8" );
if(isset($_POST['submit'])) {
    if(isset($_POST['CommentName'])) {
        if(isset($_POST['CommentContent'])) {
            addComment($_POST['CommentName'],$_POST['CommentContent']);
            header("Location: derger.php");
        } else { "text missing";
        }
    } else {
        echo "name missing";
        include('herger.php'); 
    }
} else {
    header("Location: werger.php");
}
?>