Author: lolol0l0l

Description:
This bug was seen on Wikipedia English. Special:Version states the version in use is r107965.

For a few pages of list=allusers in the API, the iteration is fine, returning the next 500 users correctly.

At the user $champange$, however, processing one of the 500 users to be returned causes the following error:

CODE: internal_api_error_MWException
INFO: Exception Caught: Internal error in ApiResult::setIndexedTagName: Bad parameter

#0 /usr/local/apache/common-local/php-1.18/includes/api/ApiBase.php(1255): wfDebugDieBacktrace('Internal error ...')
#1 /usr/local/apache/common-local/php-1.18/includes/api/ApiResult.php(202): ApiBase::dieDebug('ApiResult::setI...', 'Bad parameter')
#2 /usr/local/apache/common-local/php-1.18/includes/api/ApiQueryAllUsers.php(249): ApiResult->setIndexedTagName(NULL, 'g')
#3 /usr/local/apache/common-local/php-1.18/includes/api/ApiQuery.php(270): ApiQueryAllUsers->execute()
#4 /usr/local/apache/common-local/php-1.18/includes/api/ApiMain.php(692): ApiQuery->execute()
#5 /usr/local/apache/common-local/php-1.18/includes/api/ApiMain.php(358): ApiMain->executeAction()
#6 /usr/local/apache/common-local/php-1.18/includes/api/ApiMain.php(342): ApiMain->executeActionWithErrorHandling()
#7 /usr/local/apache/common-local/php-1.18/api.php(115): ApiMain->execute()
#8 /usr/local/apache/common-local/live-1.5/api.php(3): require('/usr/local/apac...')
#9 {main}

Version: 1.18.x
Severity: normal
URL: http://en.wikipedia.org/w/api.php?action=query&aufrom=%24champange%24&aulimit=max&auprop=editcount|groups&format=xml&list=allusers