StringIndexOutOfBoundsException: 00000000

This one I've Looked at over and over and can't figure it out.  It tests fine via HTTP URL but when I attempt to run it by clicking the button it flakes on me and I get the StringIndexOutOfBoundsException: 00000000.   The code is straight forward. I'm doing an AGS call to a process flow trigger via WFWK.1.  It begins to exicute  but then crashes.

function BUTTON_OnClick(id, row)
{
        if (id == “push5”)
      {
       var vUpdate=lawForm.getDataValueById("select5"); 
       if (vUpdate == "2")
          {
           var s = portalWnd.AGSPath+"?_PDL=LAWAPP9&_TKN=WFWK.1"+
                   "&_EVT=ADD&_RTN=DATA&_LFN=ALL&_TDS=IGNORE&FC=Add"+
                   "&SERVICE=LP31&CRITERION-1=88&WORK-TITLE=LP31Test"+
                   "&_DELIM=%09&_OUT=TEXT&_EOT=TRUE";

           portalWnd.httpRequest(s);
           } 

      }

 return true;
}