Thanks for letting me know about this! You shouldn’t be getting this message, but it probably does not indicate an actual problem and it should not recur (except possibly at the time of version upgrades).
This is the first report of it from others, but there is one harmless gremlin that I have been chasing:
WP Issues CRM does create new tables in your database for efficient storage of constituent data. It uses the standard WordPress database upgrade routine (dbDelta in upgrade.php) to do that. I have myself seen on a few occasions at the time of version upgrades a spurious message (originating from MySQL) suggesting dup key error in the table creation process.
However, there are definitely no dup keys being created by WP Issues CRM and the error is intermittent, occurring only on some upgrades/installs, so I chalk this up to a glitch in dbDelta — I’ve been unable to narrow it further to date.
If you install a log viewer plugin and turn debug on you can view the underlying error message.
You may see a message like the following:
[17-Apr-2016 09:37:10 UTC] WordPress database error Duplicate key name 'time_stamp' for query ALTER TABLE wp_wic_activity ADD KEY time_stamp ( email_batch_time_stamp ) made by require_once('wp-load.php'), require_once('wp-config.php'), require_once('wp-settings.php'), do_action('plugins_loaded'), call_user_func_array, WIC_DB_Setup::update_db_check, WIC_DB_Setup::database_setup, dbDelta
I’d actually be very interested to confirm that that is the message you are getting. That’s the harmless gremlin I am aware of and will continue to pursue, but if you see another message, I’d be even more eager to know about it.
