Variation product price equal values bug

Hi!
I’m use WC 2.0.4 and i have some bug
When i create variable product and add variation, e.g.:
red – $1000
green – $1000
in single product page price is empty

if variarion have another price
red – $1000
green – $1001
in single product page price shown correct.

Only equal values in variation have this bug.

How fix this? Thanks

http://ww.wp.xz.cn/extend/plugins/woocommerce/