If this function is used outside The Loop and the post doesn’t have a custom excerpt, this function will use wp_trim_excerpt() to generate an excerpt. That function uses get_the_content(), which must be used with The Loop and will cause problems if get_the_excerpt() is being used outside The Loop. In order to avoid the issues, use setup_postdata() prior to calling get_the_excerpt() to set up the global $post object.
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