In the SQL patch tool, I get the error "ERROR: Cannot insert configuration_key "" because it already exists", with perfectly valid SQL.
In the configuration table, there is an record with a configuration_title "Installed Modules" which has an empty configuration_key.
If I delete this record or put any value in its configuration_key, the SQL patch tool will process the sql happily.
This record is inserted by admin/modules.php, I believe related to the install/uninstall of ZC internal modules (payment, shipping etc.).
I know I have previously commented on this and deleted the empty entry but is has re-appeared so there is something that requires investigation, whether its the creation of this incomplete record or the behaviour of the SQL tool.
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