Survey is showing undefined

[nameisnani]

Hi Team ,

while clicking on the emoji , coming as undefind 

(function runMailScript( /* GlideRecord */ current, /* TemplatePrinter */ template,
    /* Optional EmailOutbound */
    email, /* Optional GlideRecord */ email_action,
    /* Optional GlideRecord */
    event) {


    gs.log("current " + current.number, 'sys');

    var surv = new GlideRecord('asmt_assessment_instance');
    surv.addNotNullQuery('trigger_id');
    surv.addQuery('trigger_id', current.sys_id);
    surv.query();
    surv.next();
    gs.log("Incident from survey " + surv.number, 'sys');

    var params = current.number + "," + surv.number;
    //var subject = "survey:" + surv.number + " " + " " + "incident:" + current.number + " ";
    var subject = "Reminder:Please share your feedback on " + "Incident: " + current.number;
    //+ " " + ": Survey Number : " + surv.number;
    email.setSubject(subject);



    template.print('<a href="' + gs.getProperty('glide.servlet.uri') + '/sp?id=take_survey&instance_id=' + surv.sys_id + '"><img src="CSAT.png" width="280" height="55"/></a>');





})(current, template, email, email_action, event);

This is the email script , what will be error can anyone please help me here .

How to sort it out .

@Anil Lande 

Thanks in adavance 

[nameisnani]

@Anil Lande  any help here please