[Plugin: Special Recent Posts] Read more link duplicated when using excerpt

Hello!
When I use excerpts in my posts, I have “Read more” link duplicated, but when I don’t fill the excerpt, it’s allright.
Indeed, I have a function which adds that link when excerpt is used.

How could I use the_excerpt in the widget without the “Read more” link?

Any help would be much appreciated.

http://ww.wp.xz.cn/extend/plugins/special-recent-posts/