Dashtrends not show average sales per day when onmouseover

[cobrax13]

Hello, I have a problem with the dashtrends module. When I charge the admin page and I pass the mouse over the grafic not show the average sales per day, but if a go to orders I can see the order per day... I have 1.6.1.2 version, but in 1.6.0.9 didn't work it. I can see one error on dashtrends.js in line 41. The firebug say currency_format is not defined

 

Someone have any idea about this error? I attach to images to see it.

 

Thans for all.

Edited November 2, 2015 by cobrax13 (see edit history)