AJAX is skipping success function - php

Question

My Ajax function is skipping my success function, but yet I can still get my php script to run.
Below is my JavaScript function containing my AJAX call. Here's an explanation of what I'm experiencing:
If I put a alert("msg"); in my success function, it NEVER gets hit.
It goes to the error function every time.
However, if I put an alert("error"); in my error function, then my php file still runs and my data is entered into the database correctly.
If I removed alert("error"); from the error function, my php file does not run and nothing is added.
... It's almost as if I need that alert message in my error function to halt the code (or something), in order for my my php file to run.
Does this make sense to anyone?
<script>
function AddItem(){
var name = document.forms["additemform"]["nc_name"].value;
var tag = document.forms["additemform"]["nc_tag"].value;
var table = "<?php echo $_SESSION['UserItemTable']; ?>";
var isValid = false;
$.ajax({
type: "POST",
url: "/AddItem.php",
data: {
"Item_Name": name,
"Tag_Num": tag,
"Table_Name": table
},
dataType: "json",
success: function(resp){
console.log(resp);
alert('msg");
if(resp.reply == "Success")
{
}
else
{
}
},
error: function(data, status){
console.log(data, status);
alert("error");
}
}); //end Ajax
The message that is dumped out in my console is this:
{
readyState: 0,
getResponseHeader: function,
getAllResponseHeaders: function,
setRequestHeader: function,
overrideMimeType: function,
…}
Not sure why my code is not executed...

Answer 1

I don't know if you have this typo in your code as well as in this example, but you have written:
alert('msg");
... both a single and a double-quote. That screws up the execution.