TypeError: " is undefined "

Hello,

I am getting the following error:

TypeError: global.srchVals[PMItms[j]] is undefined

The code is failing at this line:

global.srchVals[PMItms[j]].srchPgs = PMPgs;

Here is more of the code up to the point where it fails:

function subSrchValPM() {

    var srchThisStr = "";
  srchThisStr = this.getField(1).valueAsString;
var srchThisArr = srchThisStr.replace(/\s/g,"").split(",");
var nNumWords = srchThisArr.length;
var myArr = [];  //var myArr = new Array();
for(i = 0; i <= nNumWords; i++){  //for (var i in srchThisArr)
       myArr.push("" + srchThisArr[i]);
    //return myArr;
   }


global.srchVals = [{}]
for (i = 0; i<= nNumWords; i++) {
  global.srchVals[i] = {srchTrm: trim(""+myArr[i]).valueAsString, mode: 0, results: []}; //

}
 

// Payor Mix
var PMAddItms = "";
var PMLstItms = "";
for (var i=1; i<= nNumWords; i++) {
      global.srchVals[i].name = "Payor Mix";
   global.srchVals[i].mode = 0;

  PMAddItms = i;
  
   if (i < nNumWords) {
   PMLstItms = PMLstItms + PMAddItms + ",";
  } else {
   PMLstItms = PMLstItms + PMAddItms;
  }

 
}
  var PMItms = [PMLstItms];
 

for (var i in global.srchVals) {
  global.srchVals[i].srchPgs = [];
  global.srchVals[i].matchTerm = getMatchTerm(global.srchVals[i].srchTrm, global.srchVals[i].mode);
}
 
this.closeDoc(true);

var t = app.thermometer;
t.begin();

t.text = "Processing bookmarks...";
var PMPgs = [];
for (var i=0; i<global.mainDoc.bookmarkRoot.children.length; i++) {
  if (global.mainDoc.bookmarkRoot.children[i].name.indexOf("Payor Mix")!=-1)  {
   PMPgs = getBookmarkRange(global.mainDoc, global.mainDoc.bookmarkRoot, i); 
   //PMPgs = PMPgs.slice(PMPgs.length -1);  // Use first page of the bookmark
   for (var j in PMItms)
    global.srchVals[PMItms[j]].srchPgs = PMPgs;  // Here is where the error happens
  }
}

....... the rest of the code ......

}

Why am I getting an "is undefined" error?

Thanks

Linda