Entity script error is nor descriptive enough

[ksuprynowicz]

It also doesn't show in Developer->Script log
The error is:
[WARNING] [overte.scriptengine.v8] JS function call failed

(function () {
    var followingEntityID = blshaj;  

    this.clickDownOnEntity = function (entityID, mouseEvent) {
        if (!followingEntityID) {
            followingEntityID = entityID;
            Entities.editEntity(entityID, { color: { red: 0, green: 255, blue: 255 } });
        }
    };

    this.mousePressOnEntity = function (entityID, mouseEvent) {
        if (followingEntityID === entityID) {
            var followedPosition = Entities.getEntityProperties(entityID, 'position').position;

 
            var blsha1Position = Entities.getEntityProperties(this.entityID, 'position').position;
            var newPosition = Vec3.mix(blahajPosition, followedPosition, 0.1);  // Smoothing factor

            Entities.editEntity(this.entityID, { position: newPosition });
        }
    };

    this.hoverLeaveEntity = function (entityID, mouseEvent) {
        if (followingEntityID === entityID) {
            followingEntityID = null;
            Entities.editEntity(entityID, { color: { red: 255, green: 255, blue: 0 } });
        }
    }; 
})