New visit created for each action with userid populated since 3.13

[tolomaus]

Since upgrading to 3.13 all of the sessions where a user id was set get a new visit created for each action.

I'm using the piwik_java_tracker and looking at the code it puts a new random string the the visitor id of each request. This has worked fine in the past, both when a user id was set and when one was not set.

As a workaround: explicitly setting the visitor id to a hex value derived from the user id whenever a userid is set seems to do the trick.

But ideally it should just follow the same logic as the scenario without a user id. There as well, a unique visitor id is created for each request by the piwik_java_tracker but at least the server side is able to group all actions into one session.

See also matomo-org/matomo#15299

[mattab]

Hi @tolomaus Thanks for the suggestion. Maybe you are able to open a Pull request on this project? This would be very helpful and help solve this issue quickly.

[tolomaus]

Hello Matthieu,

No problem, but could you explain what should be the logic for populating the visitor id? What I described was just a workaround to avoid the spikes in "new visitors".

[itmagpro]

I confirm this problem!

This bug appear for user which disable cookies, then matomo for same uid (d2f22ac701961993) generate different cid (8cbf24c93d0f4628 | c3f6fec89ef58cb4) for each visit.

Multiple unique visit for each action for same User ID
matomo-org/matomo#15320

[mattab]

@tolomaus @itmagpro Could you please upgrade to Matomo 3.13.1 and confirm whether this is still an issue or not? Thanks for confirming!

[tolomaus]

Hi Matthieu,

Thanks for the follow up. I can confirm that since I upgraded last Friday (17/01) the issue is solved.

Many thanks!