Mysqli statement execute error : Prepared statement needs to be re-prepared

I seem to be breaking things lately! I left my computer for a while and didn't logout. Tried editing an item that was open upon my return, and ended up with this error:

Mysqli statement execute error : Prepared statement needs to be re-prepared

#0 .../omeka/application/libraries/Zend/Db/Statement.php(300): Zend_Db_Statement_Mysqli->_execute(Array)
#1 .../omeka/application/libraries/Zend/Db/Adapter/Abstract.php(468): Zend_Db_Statement->execute(Array)
#2 .../omeka/application/libraries/Zend/Db/Adapter/Abstract.php(725): Zend_Db_Adapter_Abstract->query(Object(Omeka_Db_Select), Array)
#3 .../omeka/application/libraries/Omeka/Db.php(82): Zend_Db_Adapter_Abstract->fetchRow(Object(Omeka_Db_Select), Array)
#4 .../omeka/application/libraries/Omeka/Db/Table.php(500): Omeka_Db->__call(Array, Array)
#5 .../omeka/application/libraries/Omeka/Db/Table.php(500): Omeka_Db->fetchRow('fetchRow', Array)
#6 .../omeka/application/libraries/Omeka/Db/Table.php(219): Omeka_Db_Table->fetchObject(Object(Omeka_Db_Select), Array)
#7 .../omeka/application/libraries/Omeka/Core/Resource/Currentuser.php(41): Omeka_Db_Table->find(Object(Omeka_Db_Select), Array)
#8 .../omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(676): Omeka_Core_Resource_Currentuser->init(1)
#9 .../omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(619): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource()
#10 .../omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(579): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('currentuser')
#11 .../omeka/application/libraries/Zend/Application.php(347): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap(NULL)
#12 .../omeka/application/libraries/Omeka/Core.php(114): Zend_Application->bootstrap(NULL)
#13 .../omeka/admin/index.php(37): Omeka_Core->initialize()
#14 {main}

When I try to access Omeka using another browser I can't get past the admin login screen.

Nooooo idea what this error message means. Googling wasn't much help either - way beyond me!

This error is coming from the MySQL server you're running Omeka on.

If you have control over the server, the first thing I'd try is to simply re-start it. If not, this looks like a problem that should be referred to tech support or server admins if it continues.

Thanks! That's what I suspected :) But I was wondering what might have caused it - don't want to do it again.

I'm now getting this error appearing in a red-shaded box when I try and save changes after editing an item :( Seems to be happening when someone else is logged in at the same time... ? *puzzled*