Disappearing markers when choosing custom markertype.

When I choose a different markerstyle in views, all my markers on the map disappear.

Javascript gives the following error:
TypeError: this.gicons[setname] is undefined in the function Drupal.gmap.getShadow.

When I change the function from
if (this.gshadows) return this.gshadows[setname][sequence % this.gicons[setname].length];
to
if (this.gshadows && this.gicons[setname]) return this.gshadows[setname][sequence % this.gicons[setname].length];
it starts working again.