[Plugin: WordPress SEO by Yoast] JavaScript Error

WordPress version: 3.4.1
WordPress SEO version: 1.2.4

I did this: Put a + character in the focus keyword field and saved the post. The regex started throwing a javascript error. The error I got was the following:

“SyntaxError: invalid quantifier
[Break On This Error]
kwregex = new RegExp( “([-/])(“+kw+”)([-/])?” );”

http://wordpress.org/extend/plugins/wordpress-seo/