I use the latest (master) version of Contributors as of 30.7.2016. When using the script rebuildall.php I receive this error:
# php rebuildall.php ... ** Rebuilding links tables -- this can take a long time. It should be safe to abort via ctrl+C if you get bored. Refreshing redirects table. Starting from page_id 1 of 27. Refreshing links tables. Starting from page_id 1 of 27. [4d08bc635c2269fae3cb5dae] [no req] MWException from line 141 of /html/domain.de/mediawiki/includes/FormOptions.php: Invalid option target Backtrace: #0 /html/domain.de/mediawiki/includes/FormOptions.php(176): FormOptions->validateName(string, boolean) #1 /html/domain.de/mediawiki/includes/FormOptions.php(391): FormOptions->getValue(string) #2 /html/domain.de/mediawiki/extensions/Contributors/includes/SpecialContributors.php(35): FormOptions->offsetGet(string) #3 /html/domain.de/mediawiki/includes/specialpage/SpecialPage.php(479): SpecialContributors->execute(string) #4 /html/domain.de/mediawiki/includes/specialpage/SpecialPageFactory.php(576): SpecialPage->run(string) #5 /html/domain.de/mediawiki/includes/specialpage/SpecialPageFactory.php(628): SpecialPageFactory::executePath(Title, RequestContext, boolean) #6 /html/domain.de/mediawiki/includes/parser/Parser.php(3622): SpecialPageFactory::capturePath(Title, RequestContext) #7 /html/domain.de/mediawiki/includes/parser/Preprocessor_DOM.php(1175): Parser->braceSubstitution(array, PPFrame_DOM) #8 /html/domain.de/mediawiki/includes/parser/Parser.php(3366): PPFrame_DOM->expand(PPNode_DOM, integer) #9 /html/domain.de/mediawiki/includes/parser/Parser.php(1248): Parser->replaceVariables(string) #10 /html/domain.de/mediawiki/includes/parser/Parser.php(446): Parser->internalParse(string) #11 /html/domain.de/mediawiki/includes/content/WikitextContent.php(331): Parser->parse(string, Title, ParserOptions, boolean, boolean, NULL) #12 /html/domain.de/mediawiki/includes/content/AbstractContent.php(497): WikitextContent->fillParserOutput(Title, NULL, ParserOptions, boolean, ParserOutput) #13 /html/domain.de/mediawiki/includes/content/AbstractContent.php(230): AbstractContent->getParserOutput(Title, NULL, NULL, boolean) #14 /html/domain.de/mediawiki/maintenance/refreshLinks.php(240): AbstractContent->getSecondaryDataUpdates(Title) #15 /html/domain.de/mediawiki/maintenance/refreshLinks.php(170): RefreshLinks::fixLinksFromArticle(integer) #16 /html/domain.de/mediawiki/maintenance/refreshLinks.php(58): RefreshLinks->doRefreshLinks(NULL, boolean, NULL, boolean, boolean) #17 /html/domain.de/mediawiki/maintenance/rebuildall.php(60): RefreshLinks->execute() #18 /html/domain.de/mediawiki/maintenance/doMaintenance.php(103): RebuildAll->execute() #19 /html/domain.de/mediawiki/maintenance/rebuildall.php(67): require_once(string) #20 {main}
As soon as I disable the extension Contributors, rebuildall.php finishes without any error.