Raphael minify version doesn't work on IE. Any idea?

I've an issue with the fantastic RaphaelJs lib. It doesn't work on IE 开发者_如何学C(8 and 7) if I use the minify version. It works of with the dev version.

An error is raised on paper = Raphael("canvas", 100, 100);

Any idea what can be wrong?

Thanks in advance

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This bug has been fixed : https://github.com/DmitryBaranovskiy/raphael/issues/158