MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT `rev_user` FROM `revision` WHERE rev_page=404175 LIMIT 1
Function: userIsAuthor
Error: 1053 Server shutdown in progress (localhost)
' in /var/www/adminroot/data/www/tadviser.ru/includes/db/Database.php:639
Stack trace:
#0 /var/www/adminroot/data/www/tadviser.ru/includes/db/Database.php(594): Database->reportQueryError('Server shutdown...', 1053, 'SELECT `rev_use...', 'userIsAuthor', false)
#1 /var/www/adminroot/data/www/tadviser.ru/extensions/AuthorProtect/AuthorProtect.php(165): Database->query('SELECT `rev_use...', 'userIsAuthor')
#2 /var/www/adminroot/data/www/tadviser.ru/extensions/AuthorProtect/AuthorProtect.php(36): userIsAuthor()
#3 [internal function]: efAuthorProtectDelay(Object(Title), Object(User), 'edit', NULL)
#4 /var/www/adminroot/data/www/tadviser.ru/includes/Hooks.php(127): call_user_func_array('efAuthorProtect...', Array)
#5 /var/www/adminroot/data/www/tadviser.ru/includes/Title.php(1105): wfRunHooks('userCan', Array)
#6 /var/www/adminroot/data/www/tadviser.ru/includes/Title.php(995): Title->getUserPermissionsErrorsInternal('edit', Object(User), false)
#7 /var/www/adminroot/data/www/tadviser.ru/includes/Title.php(967): Title->userCan('edit', false)
#8 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(3564): Title->quickUserCan('edit')
#9 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(1018): Parser->formatHeadings('<div class="cen...', true)
#10 /var/www/adminroot/data/www/tadviser.ru/includes/parser/Parser.php(327): Parser->internalParse('<div class="cen...')
#11 /var/www/adminroot/data/www/tadviser.ru/includes/Article.php(3465): Parser->parse('<div class="cen...', Object(Title), Object(ParserOptions), true, true, 1808030)
#12 /var/www/adminroot/data/www/tadviser.ru/includes/Article.php(925): Article->outputWikiText('<div class="cen...', false)
#13 /var/www/adminroot/data/www/tadviser.ru/includes/Wiki.php(454): Article->view()
#14 /var/www/adminroot/data/www/tadviser.ru/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#15 /var/www/adminroot/data/www/tadviser.ru/index.php(890): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#16 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in numRows(): i/ApiQueryReviewedpages.php0x562fe48cfe2b (localhost)' in /var/www/adminroot/data/www/tadviser.ru/includes/db/Database.php:800
Stack trace:
#0 /var/www/adminroot/data/www/tadviser.ru/extensions/SemanticForms/includes/SF_LinkUtils.inc(270): Database->numRows(false)
#1 /var/www/adminroot/data/www/tadviser.ru/extensions/SemanticForms/includes/SF_LinkUtils.inc(285): SFLinkUtils::getCategoriesForArticle(Object(SkinZdrav))
#2 /var/www/adminroot/data/www/tadviser.ru/extensions/SemanticForms/includes/SF_FormEditTab.php(26): SFLinkUtils::getFormForArticle(Object(SkinZdrav))
#3 [internal function]: SFFormEditTab::displayTab(Object(SkinZdrav), Array)
#4 /var/www/adminroot/data/www/tadviser.ru/includes/Hooks.php(127): call_user_func_array(Array, Array)
#5 /var/www/adminroot/data/www/tadviser.ru/includes/SkinTemplate.php(802): wfRunHooks('SkinTemplateTab...', Array)
#6 /var/www/adminroot/data/www/tadviser.ru/includes/SkinTemplate.php(436): SkinTemplate->buildContentActionUrls()
#7 /var/www/adminroot/data/www/tadviser.ru/includes/OutputPage.php(946): SkinTemplate->outputPage(Object(OutputPage))
#8 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(159): OutputPage->output()
#9 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(183): MWException->reportHTML()
#10 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(269): MWException->report()
#11 /var/www/adminroot/data/www/tadviser.ru/includes/Exception.php(327): wfReportException(Object(DBQueryError))
#12 [internal function]: wfExceptionHandler(Object(DBQueryError))
#13 {main}