That is because it is the main repo, the core files of the framework are available in https://github.com/Usbac/wolff-framework :)
Thanks!
But why is it prone to sql injection?
https://github.com/Usbac/wolff-framework/blob/master/system/... (Line 294)
(This was the first LOC I randomly picked)
Oh well, I better stop looking further.
But anyway, I updated the framework and now any character that is not a letter, number or underscore is removed from the parameters that represent a table or column name. Also, a warning has been added to those function documentation's thanks to your comment.
Thank you :)