error -2147467259

[ravindra patil]

HI I am getting above error IE9 when executing below script works fine on IE8/FF

function matchFrame(strName){
  var objFrame = null;
                try
                { // alert('Start1');
                	if(objWindow && objWindow.frames){
                		for (var i = 0; i < objWindow.frames.length ; i++) {
                	
                         	if ( objWindow.frames[i].name && objWindow.frames[i].name == strName) {
                         		
                          		objFrame = objWindow.frames[i];
                          		
                          		break; 
                          	}
                          }
                	}
                
                }
                catch(e) {
                	alert('exce'+e.number);
                        }
}

this happens for only one frame code works fine for other frams