std.encoding:2554 - Unrecognized Encoding: big5 - Please help!

[spikespaz via Digitalmars-d]

I have a user who submitted a bug report for one of my projects. 
The error is in std\encoding.d on line 2554.

The problem arises when he types 
"google.com.hk/search?q={{query}}" (exact string) into this 
function:
https://github.com/spikespaz/search-deflector/blob/master/source/setup.d#L253-L278
Here is the issue on GH:
https://github.com/spikespaz/search-deflector/issues/12

I really can't figure this one out and any help would be 
appreciated. Thanks.