Field Value of Loaded List Item is Unexpectedly Returning “NaN”

I’m trying to query the last item in the current list where status = New, so I can auto-populate one of the fields based on the previous item’s value. Executing “alert(collListItem);” displays “[object] [Object]”, and the onQuerySucceeded function is in fact firing, however, the value it’s inputing is “NaN” when it should be the previous number field value +1 (the previous value is 1).

var collListItem; function QueryLastNewItem() {     var clientContext = new SP.ClientContext();     var List = clientContext.get_web().get_lists().getByTitle('Tracker');     var query = new SP.CamlQuery();     query.set_viewXml("<View><RowLimit>1</RowLimit><Query><OrderBy><FieldRef Name='ID' Ascending='False' /></OrderBy><Where><Eq><FieldRef Name='Status' /><Value Type='Choice'>New</Value></Eq></Where></Query></View>");     collListItem = List.getItems(query);     clientContext.load(collListItem);     alert(collListItem);     clientContext.executeQueryAsync(Function.createDelegate(this,  this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));          }  function onQuerySucceeded(sender, args) {      //Once the list item is loaded, populate number field with the previous number field plus 1     if ($  ("select[id^='Is_x0020_this_x0020_item_x002']").val() == "New")          {         $  ("input[id^='Number']").val(collListItem.get_item("Number")+1);         } }   function onQueryFailed(sender, args) {     alert('Request failed. \nError: ' + args.get_message() + '\nStackTrace: ' + args.get_stackTrace()); } 

Since the query seems to be successful, I’m confused as to why the value isn’t being assigned appropriately. I thought it may be because “collListItem” could be considered a collection of objects, but I have set the row limit to 1 in the CAML query, so it should only contain 1 item.

Any help or suggestions are much appreciated.