404 errors with some images from contrib modules.

Hello.

I have realize that when I enable advagg the start from the module fivestart are not printed, they give a 404. Fivestart module is enable in /sites/all/modules/fivestart/

I have try this:

• With no css cache from core the starts are printed.
• With css compress by the core the starts are printed.
• With the module "Advanced CSS/JS Aggregation" enabled the start are not printed.

The css code from fivestart module is:
background: url(../widgets/default/star.gif) no-repeat 0 0;

When I enable "Advanced CSS/JS Aggregation" I got this path:
background: url(/all/modules/fivestar/widgets/default/star.gif) (without the '/sites').

I can't past the debug because when I enable the ?advagg-debug=1 I got this error in watchdog:
PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'source' at row ....