Error updating to 2.0.19 on QueryString

[Portugal]

Hi all,

Today i try to upgrade my forum, and ive an error on Sources/QueryString.php, i think thats about some login box in my theme (Redsy), its secure to make this change manually? My actual version is 2.0.18 and i want to apdate to 2.0.19.
Send an attachment to better explain!

Thanks all

Regards
Portugal

[Kindred]

https://wiki.simplemachines.org/smf/Error_in_mod_installation