Why do you try to compare a string with lowest/highest?
Are you rather trying to compare the length of the string?
Anyway, I gave it a look, and it seems to be a real bug.
If you are really in a hurry you can try replacing C:/..../construct2/exporter/html5/eveng.js with this one :
eveng.js
Use this at your own risk (: (in any case it will be replace by a new update)
The only thing I added in it was on line 1868 :
replace:
this.get = this.get_familyvar;[/code:2wq8ymuv]by:[code:2wq8ymuv]
this.get = function() {
return this.get_familyvar(this.index);
};[/code:2wq8ymuv]
Note that it's not enough, you also have to check that instances are present, doing this (else you'll also get an error):
[img="http://img208.imageshack.us/img208/9181/325i.png"]