MySQL - Duplicate Entry when trying to install a Plugin I'm trying to install a Plugin on my MySQL database, but each time I try I get a Duplicate Entry error:

INSTALL PLUGIN audit_log SONAME 'audit_log.so';
Error Code: 1062. Duplicate entry 'audit_log' for key 'PRIMARY'


But If I run:

SHOW PLUGINS;
SELECT * FROM `information_schema`.`plugins`;


There is no sign of it.

If I run SELECT * FROM mysql.plugin; then there is an entry for it. 

But If I run UNINSTALL PLUGIN audit_log; then it tells me it doesn't exist. Error Code: 1305. PLUGIN audit_log does not exist

I know the file is there, because there are two databases on this server running under mysqld_multi and it installed fine under the other one.

The server is 5.5.54, the server is Debian 8 (jessie).

Is there anything else I can do? Can I simply delete it from the mysql.plugin table without causing problems? Restarting the server isn't feasible as it is my master database.
In the end, I renamed the entry in mysql.plugin, and then I was able to install it. Once I checked it was OK I then removed the entry in mysql.plugin.

So far it seems to be working fine,