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Try this: if( get_comment_author() == get_comment_author_link() ) echo get_avatar( $comment, $size='75' ); else echo '<a href="' . get_comment_author_url . '">' . get_avatar( $comment, $size='75' ) . '</a>';
Try this Solution.This will surely helps you. Replace your wp-includes and wp-admin folder with WordPress's core folder from WordPress package. May be you have problem with uploading these two folders and this may lead you that problem.
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