reproduce:
https://mediawiki.org/w/index.php?namespace=-1%27&month=-1&limit=50&title=Special:Contributions&contribs=newbie&contribs=user&target=217.23.7.140&nsInvert=1&associated=1&tagfilter=1&topOnly=1&newOnly=1&hideMinor=1&year=2016
`MWNamespace::getAssociated does not make any sense for given namespace -1`
```
#0 /srv/mediawiki/php-1.29.0-wmf.2/includes/MWNamespace.php(142): MWNamespace::isMethodValidFor(integer, string)
#1 /srv/mediawiki/php-1.29.0-wmf.2/includes/specials/pagers/ContribsPager.php(274): MWNamespace::getAssociated(integer)
#2 /srv/mediawiki/php-1.29.0-wmf.2/includes/specials/pagers/ContribsPager.php(159): ContribsPager->getNamespaceCond()
#3 /srv/mediawiki/php-1.29.0-wmf.2/includes/pager/IndexPager.php(378): ContribsPager->getQueryInfo()
#4 /srv/mediawiki/php-1.29.0-wmf.2/includes/specials/pagers/ContribsPager.php(101): IndexPager->buildQueryInfo(string, integer, boolean)
#5 /srv/mediawiki/php-1.29.0-wmf.2/includes/pager/IndexPager.php(214): ContribsPager->reallyDoQuery(string, integer, boolean)
#6 /srv/mediawiki/php-1.29.0-wmf.2/includes/pager/IndexPager.php(554): IndexPager->doQuery()
#7 /srv/mediawiki/php-1.29.0-wmf.2/includes/specials/SpecialContributions.php(203): IndexPager->getNumRows()
#8 /srv/mediawiki/php-1.29.0-wmf.2/includes/specialpage/SpecialPage.php(522): SpecialContributions->execute(NULL)
#9 /srv/mediawiki/php-1.29.0-wmf.2/includes/specialpage/SpecialPageFactory.php(584): SpecialPage->run(NULL)
#10 /srv/mediawiki/php-1.29.0-wmf.2/includes/MediaWiki.php(283): SpecialPageFactory::executePath(Title, RequestContext)
#11 /srv/mediawiki/php-1.29.0-wmf.2/includes/MediaWiki.php(861): MediaWiki->performRequest()
#12 /srv/mediawiki/php-1.29.0-wmf.2/includes/MediaWiki.php(522): MediaWiki->main()
#13 /srv/mediawiki/php-1.29.0-wmf.2/index.php(43): MediaWiki->run()
#14 /srv/mediawiki/w/index.php(3): include(string)
#15 {main}
```