textItem font Error 8500: The request property does not exist

Hi All,

I got the below error for some of the files and working fine in some other files.

Code for reference

convertRXLayers(app.activeDocument);
function convertRXLayers(doc){
	
	for (var m = doc.layers.length-1; m >= 0; m--){
		
		var myLayerInvisible = 'FALSE'
		var theLayer = doc.layers[m];
		
		if(theLayer.visible == false) {
			myLayerInvisible = 'TRUE'
		}
		
		if (theLayer.typename === 'ArtLayer'){
			if(theLayer.kind == LayerKind.TEXT) { 
				//try{
					if(theLayer.textItem.font.indexOf("SFPro") > -1){//this line got error
						convertToShape(theLayer);
						if(myLayerInvisible === 'TRUE'){
							app.activeLayer = theLayer
							app.activeLayer.visible = false
						}
					}
			//	}catch(e){}
			}
			else{
				continue
			}
		}
		else{
			convertRXLayers(theLayer);
		}
	}
}

Thanks