Polygon intersection using turf js

Question

I have given this code for intersection:

function intersectPolyByPolyFC(poly,fcPoly){
        var fgp=[];//variable for feature group
        var bbPoly=turf.bboxPolygon(turf.bbox(poly));//polygon representation of the bounding box of a reference polygon
        for(var i=0;i<fcPoly.features.length;i++){//loop through the feature collection of polygons
            var bb=turf.bboxPolygon(turf.bbox(fcPoly.features[i]));//variable bb represents each polygon for feature collection
            if(turf.intersect(bbPoly,bb)){//condition to check if the two bounding boxes intersect
                var int= turf.intersect(poly,fcPoly.features[i]);
                if(int){
                    int.properties=fcPoly.features[i].properties;
                    fgp.push(int);
                }
            }
        }
        return turf.featureCollection(fgp);
    }

and the function definition I have given as

var bufline=turf.buffer(line,0.05,{units:"kilometers"});
var intBUOWL= intersectPolyByPolyFC(bufline, lyrBUOWL.toGeoJSON());
L.geoJSON(intBUOWL,{style:{color:'red',weight:5}}).addTo(mymap);

When I am drawing a line over a polygon for intersection I am getting this error

Uncaught TypeError: Cannot read property 'map' of undefined
    at Object.t.collect (turf.min.js:1)
    at summarizePointsByLine (buffer.html:440)
    at NewClass.<anonymous> (buffer.html:155)
    at NewClass.fire (Events.js:190)
    at NewClass._fireCreatedEvent (leaflet.draw.js:8)
    at NewClass._fireCreatedEvent (leaflet.draw.js:8)
    at NewClass.completeShape (leaflet.draw.js:8)
    at HTMLAnchorElement.handler (DomEvent.js:92)

How can I resolve this error?