Hangman Error Meldung

You get more information about the problem in our knowledge base: http://www.woltlab.com/help/?code=1062 Information:
  error message: Invalid SQL: UPDATEwcf1_hangman SET word = 'SAILOR MOON',      tipp = 'anime' WHERE wordID = 1536
 error code: 1062
 sql type: MySQLDatabase
sql error: Duplicate entry 'SAILOR MOON' for key 2
sql error number: 1062
sql version: 
file: /www/htdocs/xxxxxxxx/board/wcf/lib/system/database/MySQLDatabase.class.php (116)
 php version: 5.2.6
 wcf version: 1.0.10 (Horizon)
 date: Tue, 14 Oct 2008 16:09:54 +0000
 request: /acp/index.php?form=HangmanEdit
 referer: http://www.quadpowersaar.de/acp/index.php?form=HangmanEdit&wordID=1536&packageID=38&
   Stacktrace:
 #0 /www/htdocs/xxxxxxxx/board/wcf/lib/data/game/hangman/Hangman.class.php(54): MySQLDatabase->sendQuery('UPDATE?wcf1_han...')
#1 /www/htdocs/xxxxxxxx/board/wcf/lib/acp/form/HangmanEditForm.class.php(65): Hangman::update('SAILOR MOON', 'anime', 1536)
#2 /www/htdocs/xxxxxxxx/board/wcf/lib/form/AbstractForm.class.php(43): HangmanEditForm->save()
#3 /www/htdocs/xxxxxxxx/board/wcf/lib/form/AbstractForm.class.php(88): AbstractForm->submit()
#4 /www/htdocs/xxxxxxxx/board/wcf/lib/acp/form/HangmanEditForm.class.php(82): AbstractForm->readData()
#5 /www/htdocs/xxxxxxxx/board/wcf/lib/page/AbstractPage.class.php(74): HangmanEditForm->readData()
#6 /www/htdocs/xxxxxxxx/board/wcf/lib/acp/form/ACPForm.class.php(37): AbstractPage->show()
#7 /www/htdocs/xxxxxxxx/board/wcf/lib/acp/form/HangmanEditForm.class.php(112): ACPForm->show()
#8 /www/htdocs/xxxxxxxx/board/wcf/lib/page/AbstractPage.class.php(36): HangmanEditForm->show()
#9 /www/htdocs/xxxxxxxx/board/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#10 /www/htdocs/xxxxxxxx/board/wcf/lib/util/RequestHandler.class.php(94): RequestHandler->__construct('HangmanEdit', Array, 'form')
#11 /www/htdocs/xxxxxxxx/board/acp/index.php(8): RequestHandler::handle(Array)
#12 {main}