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after update - Error SQL Duplicate key name idx_al

cluster
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after update - Error SQL Duplicate key name idx_al was created by cluster

Posted 7 years 3 days ago #23299

after a quickstart installation and a joomla update afterwards I get a Duplicate key error and I can not add or open a content article.
how can I fix this issues?

Code:

JInstaller: :Install: Error SQL Duplicate key name 'idx_alias'
Files Update: SQL error file DB function failed with error number 1061 
Duplicate key name 'idx_alias'
SQL =
ALTER TABLE `#__content` ADD INDEX `idx_alias` (`alias`(191));
Before you update Joomla, ensure that the installed extensions are available for the new Joomla version. 
You are strongly advised to make a backup of your installation before you start updating.

by cluster