[Plugin: AddThis] Code error for IE

WP 3.0.3

Addthis plugin is inserting a piece of code that cannot be digested by IE.
These

<br />
<script type="text/javascript">//<!-- var addthis_product = wpp-250';
var addthis_append_data = 'true';var addthis_language = 'de';</script>

are the lines that IE is getting hick-ups over and in response refuses to load anything that’s coming later in row, i.e. the sidebar.

I think, the error is on line 340 of addthis_social_widget.php