UI action redirection to previous page issue

[KaMmILa__]

we have a UI action Cancel Task on workorder table when clicked it should make the reason for cancellation field mandatory and visible and if entered then it should set the state to cancel, but when I click on the UI action it is redirecting to the previously worked (used page) , not sure how to debug this and it is also not updating the record. 

Below is the UI policy to hide the field 

UI action : 

Script:

function checkReason() {
    g_form.setDisplay("u_cancel_reason", true);
    if (g_form.getValue('u_cancel_reason') == '') {
        g_form.setMandatory("u_cancel_reason", true);
        gs.addErrorMessage("a change task must be added before submitting the change");
        //alert('Please enter the reason before cancellation');
        return false;
    }

    gsftSubmit(null, g_form.getFormElement(), 'cancel'); // give the action name of your UI Action

}

if (typeof window == 'undefined')
    serverResolve();

function serverResolve() {
    new global.StateFlow().processFlow(current, 'ffc7a360d7230100fceaa6859e6103ae', 'manual');
    //Moving redirect from state flow to UI action
    action.setRedirectURL(current);
}

When clicked on the UI action , cancel reason will be mandatory and if selected , there is a OOB in UI action which will enforce worknotes mandatory ,

This is the OOB code 

new global.StateFlow().processFlow(current, 'ffc7a360d7230100fceaa6859e6103ae', 'manual');
//Moving redirect from state flow to UI action
action.setRedirectURL(current);

[Slava Savitsky]

Add a debug statement inside each of these IF blocks to see which of the conditions fails:

if (this._needsUpdate(gr, type, executedScript, gr.end_text.nil())) {

if ((!this._isNewRecord(current, type)) || (type == "manual")) {

[KaMmILa__]

The client part is working but not the Server side 

[KaMmILa__]

I just double check the table on which the UI action and My record are same ((same table)

I inactivated the UI action and make sure that is the UI action I am working ( working on correct one) 

I unchecked the Client checkox and just added to update the SD ( still redirects to previous page)

I cleared the condition too But still no luck.

[Bala Krishna2]

Give a try catch in server side code and add info log to check for any error. Usually when code comes across any error other lines might not be executed.

[KaMmILa__]

Thanks Bala, Can you please help me with the code .