I updated from 1.38.4 to 1.39.4 and raned the update script, the script exits withe the following error:
Modifying tl_namespace field of table templatelinks...Wikimedia\Rdbms\DBQueryError from line 1618 of /var/www/html/w/includes/libs/rdbms/database/Database.php: Error 1091: Can't DROP INDEX `PRIMARY`; check that it exists Function: Wikimedia\Rdbms\Database::sourceFile( /var/www/html/w/maintenance/archives/patch-templatelinks-tl_title-nullable.sql ) Query: ALTER TABLE `mw_templatelinks` DROP PRIMARY KEY
# 0 /var/www/html/w/includes/libs/rdbms/database/Database.php(1602): Wikimedia\Rdbms\Database->getQueryException('Can't DROP INDE...', 1091, 'ALTER TABLE `m...', 'Wikimedia\\Rdbms...') # 1 /var/www/html/w/includes/libs/rdbms/database/Database.php(1576): Wikimedia\Rdbms\Database->getQueryExceptionAndLog('Can't DROP INDE...', 1091, 'ALTER TABLE `m...', 'Wikimedia\\Rdbms...') # 2 /var/www/html/w/includes/libs/rdbms/database/Database.php(952): Wikimedia\Rdbms\Database->reportQueryError('Can't DROP INDE...', 1091, 'ALTER TABLE `m...', 'Wikimedia\\Rdbms...', false) # 3 /var/www/html/w/includes/libs/rdbms/database/Database.php(3302): Wikimedia\Rdbms\Database->query('ALTER TABLE `m...', 'Wikimedia\\Rdbms...') # 4 /var/www/html/w/includes/libs/rdbms/database/Database.php(3241): Wikimedia\Rdbms\Database->sourceStream(Resource id #1341, NULL, NULL, 'Wikimedia\\Rdbms...', NULL) # 5 /var/www/html/w/includes/libs/rdbms/database/DBConnRef.php(103): Wikimedia\Rdbms\Database->sourceFile('/var/www/html/w...') # 6 /var/www/html/w/includes/libs/rdbms/database/DBConnRef.php(807): Wikimedia\Rdbms\DBConnRef->__call('sourceFile', Array) # 7 /var/www/html/w/includes/installer/DatabaseUpdater.php(718): Wikimedia\Rdbms\DBConnRef->sourceFile('/var/www/html/w...') # 8 /var/www/html/w/includes/installer/DatabaseUpdater.php(1000): DatabaseUpdater->applyPatch('/var/www/html/w...', false, 'Modifying tl_na...') # 9 /var/www/html/w/includes/installer/DatabaseUpdater.php(547): DatabaseUpdater->modifyField('templatelinks', 'tl_namespace', 'patch-templatel...') # 10 /var/www/html/w/includes/installer/DatabaseUpdater.php(511): DatabaseUpdater->runUpdates(Array, false) # 11 /var/www/html/w/maintenance/update.php(202): DatabaseUpdater->doUpdates(Array) # 12 /var/www/html/w/maintenance/includes/MaintenanceRunner.php(309): UpdateMediaWiki->execute() # 13 /var/www/html/w/maintenance/doMaintenance.php(85): MediaWiki\Maintenance\MaintenanceRunner->run() # 14 /var/www/html/w/maintenance/update.php(312): require_once('/var/www/html/w...') # 15 {main}
what can i do to fix it?