Clicking on "Advanced" search and changing the default namespaces to search and clicking search returns:
"Exception thrown by mediawiki.special.search" load.php:150 "TypeError: this.form is null" TypeError: this.form is null Stack trace: @https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z line 4 > eval:2:185 jQuery.event.dispatch@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:65:771 jQuery.event.add/elemData.handle@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:60:313 jQuery.event.trigger@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:64:460 .trigger/<@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:75:425 .each@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:5:216 jQuery.prototype.each@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:2:215 .trigger@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:75:404 @https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z line 4 > eval:2:130 jQuery.Callbacks/fire@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:44:928 jQuery.Callbacks/self.add@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:45:488 jQuery.fn.ready@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:48:879 jQuery.fn.init@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:41:68 jQuery@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:1:637 @https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z line 4 > eval:1:84 @https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z line 4 > eval:1:1 runScript@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:160:473 execute/</checkCssHandles@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:160:958 execute/</cssHandle/<@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:161:96 jQuery.Callbacks/fire@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:44:928 jQuery.Callbacks/self.fireWith@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:46:258 jQuery.Callbacks/self.fire@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:46:301 addEmbeddedCSS@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:155:871 execute@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:161:552 mw.loader</<.implement@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:168:145 @https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z line 4 > eval:42:29 .globalEval/<@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:4:655 .globalEval@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:4:621 mw.loader</<.work@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:164:68 request@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:162:258 mw.loader</<.load@https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=20141210T212029Z:169:720 @https://www.mediawiki.org/w/index.php?title=Special%3ASearch&profile=advanced&search=mw.util.addPortletLink&fulltext=Search:248:1