TypeError: obj.layer.options is undefined leaflet.control.orderlayers.js:100

[okvittem]

This plugin fails with when overlayers miss .options.zindex. This happens for L.GPX and vector overlay. L.imageOverlay has zindex, but if you have more than one with same zindex, only the last one shows in the control. base layers shows.Code snippets failing:

var blay  = {'Statkart': topo2, 'Statkart2': topor2, 'Google':googleLayer, 'Satelitt':gsat, 'Openstreetmap':osm };
var olay = {};
mapControl = L.control.orderlayers(
blay, olay, 
{ collapsed: false,
  title: 'Order Layers', autoZIndex: true
}
);

rings.push( L.circle(to, 20, {color: 'red', fill:false}) );
var clayer = L.layerGroup(rings, {zIndex: 20});
clayer.setZIndex(20);
clayer.addTo(map);
mapControl.addOverlay(clayer, 'my rings');

Leaflet is 0.7.1 and oderLayers is straight from git.

[therealtakeshi]

Receiving the same: Uncaught TypeError: Cannot read property 'zIndex' of undefined on both L.tileLayer.betterWms and L.esri.tiledMapLayer objects.

Any workarounds recommended?