[Plugin: WordPress.com Custom CSS] Validation problem

With the W3 Validator, I’m getting 9 errors related to ampersands in the CSS generated by SAFE-CSS

Warning Line 126, Column 76: cannot generate system identifier for general entity “csblog”

An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs as described by the WDG in “Ampersands in URLs”.

Is that to be expected? Is there anything I can do to change the encoding to resolve this problem?

http://wordpress.org/extend/plugins/safecss/