Stamps.com error - ShippingZClasses.php Line 360

[sbbemn]

ZC - 1.3.8a
Stamps.com - 9.0.2
Module - 2.0.0.47809

I have installed the files and have everything set up with the appropriate web address ( /store/ ) and token. When trying to refresh orders in Stamps.com, I get get this error message and associated code... Any clue?
Note line 360 is $number=$floats[0];

Unable to download orders from https://www.webstore.com/store/ShippingZZencart.php
ERROR: SHIPPINGZCLASSES Version:2.0.0.47809
Error Type: 8
File: /opt/apache-2.2.13/htdocs/store/ShippingZClasses.php
Line: 360
Message: Undefined offset: 0

####### Function FormatNumber  #######
            //Formats number to money format
            
            function FormatNumber($number)
            {
                if($number!="")
                {
                    $matches="";
                    $floats="";
                    
                    preg_match_all('!\d+(?:\.\d+)?!', $number, $matches);
                    $floats = array_map('floatval', $matches[0]);
                    $number=$floats[0];        
                    
                    return number_format($number,2,'.','');
                }
                else
                    return "0.00";
            }