User blog comment:DaNASCAT/Technical Update: October 3, 2016/@comment-4970747-20161006060746/@comment-24473195-20161007150739

Indeed, although something that should be rare. It should probably be fixed. Minimal reproduction steps:

1. Go to http://community.wikia.com/wiki/Special:Search?query=+

2. Or, Type space, " " and click search

3. See "Server error 500"