[Plugin: WP-UserOnline] WordPress database error Duplicate entry errors

Again: this particular bug comes from the fact that the insert query doesn’t verify that the line which is being inserted doesn’t already exist. The Mingle version uses the exact same insert query, so the same bug will exist.

True that Analytics is good, and I use that too. But this plugin is called USER online. Analytics can’t tell you which USER is online, so it’s in no way a replacement for this plugin…

Hmmm anyways all I can tell you is, I was using wp-useronline and the main bug that I found was the gibberish characters in place of the user online info.

But Mingle user online seems to be just perfect. My blogs are not multi-authored. Anyways what is the main problems you guys facing with the original plugin??

…It’s documented above. This thread has nothing to do with character encoding whatsoever.

I hope that the developers of this plugin look it into all these problems some day and do something about it!

Plugins on www.remarpro.com are free and opensource. Developers contribute however much or little time they see fit, so if you’re anxious to get things fixed you should probably submit your own specific solutions/proposals (as I’ve done above) or offer to pay for their time.

Paying the developers seems to be the best way to get things done.. I hope you find a solution to your problems as well..

The duplicate errors still don’t make any sense. The unique constraint looks like this:

UNIQUE KEY useronline_id ( timestamp, user_type, user_ip )

But, before the INSERT query, there’s another query that clears all records with the same user_ip:

DELETE FROM $wpdb->useronline
WHERE user_ip = %s
OR timestamp < DATE_SUB(CURRENT_TIMESTAMP, INTERVAL %d SECOND)

So, it’s theoretically impossible to trigger a unique error, since there would be no records with the same user_ip, let alone with an exact combination of user_ip + user_type + timestamp.

Could you paste the exact error text?

>>Could you paste the exact error text?

One is copied in the first post above; unfortunately I deleted the most recent error_log, so if you need a new one I’d have to wait until it happens again. It’s much less frequent now that the ip field was expanded, but it does still happen periodically.

>>But, before the INSERT query, there’s another query that clears all records with the same user_ip

Well, as mentioned it seems to happen when the server is severely lagging. It also nearly always occurs in “chunks” – i.e. it happens 20 times in a few seconds…and then not again for a week. So perhaps i.e. while the server is lagging it falls behind on queries or something. Which is why, if the check for duplicates were done within one single query (rather than two closely-spaced but separate queries), it should be completely and utterly impossible for it to happen.

Ok, the development version (2.82-beta2) uses REPLACE instead of INSERT.

Please try it out and report back.

Just installed it and will let you know if that error pops up again – however, in doing a quick post-update test, I found something that’s definitely not right. Here’s what I did:

1) Connect to a VPN, login to my WordPress site as User1 via Chrome, view Page1
2) Disconnect from the VPN, login to my WordPress site as Admin via Firefox, and view the “users online now” page.

Thus, I explicitly viewed a known page from a different browser and IP address than the admin who is checking users online. The current page for User1 was *not* Page1. Furthermore, I noticed that it showed a GoogleBot online on Page1. It looks like signals are getting crossed – you might want to run a similar test.

Hang on – I just tried it a few more times and couldn’t get it to happen again. Strange, maybe it was a fluke – though I am pretty certain I did the test right the first time. Maybe just something leftover because I’d JUST updated/activated the plugin or something…