I've more info.
I test it again and it seems also because these error too

slot1.images2.wikia.nocookie.net/__am/62186/sass/background-align=center&background-fixed=false&background-image=<wiki
background
address>&background-tiled=true&color-body=#303641&color-buttons=#0a3073&color-header=#0a3073&color-links=#0a3073&color-page=#ffffff&page-opacity=70&widthType=3&wordmark-font=/extensions/wikia/UserLogin/css/UserSignup.css
or
&wordmark-font=/extensions/wikia/UserProfilePageV3/css/UserProfilePage.scss

HTT report
Info: 	engine: warning: serialize error for <above style address> to <local
mapping>: open error: No such file or directory (directory does NOT exist!,
file does not exist)

It seem the path is so long and it cant access via address too. This makes HTT
log file so big - I just try it a little and it's 100mb now.
Another question is that: is above format a address?
In fact, now I use HTT filter to exclude them. But I think I should report FYI