just reiterating above error report - same configuration -> same error message

Do you know if you are using any 3rd party plugins? You can find out on "Administration => Plugins" and then select "third party". If so, can you temporarily deactivate them all and see if the error still occurs?

It might be a PHP 7.1.0 issue so moving into 3.0.1 milestone for now.

third party: ExampleRssWidget (v1.0) inactive - has not been active on this 5 day old installation.
i also notice the panel 'Latest visits' (i guess it is called, i'm on danish translation 8) ) hasn't been updated the last 2 days although the 'Here and Now' panel show recent visits

Do you know if you are using any 3rd party plugins?

ExampleRssWidget (v1.0) and PiwikPro (v3.0.0) are both listed as "Inactive". I think that means I'm not using any.

i also notice the panel 'Latest visits' (i guess it is called, i'm on danish translation 8) ) hasn't been updated the last 2 days

I don't know about Latest visits (that may be a translation issue), but in the "Add a widget" dropdown, "Visitors in Real Time" shows as being in the "Live!" category, and is updating fine.

Hi,
i have the bug too, it happens if you click on a VisitorProfil.

it happens if generationTime is generated @ https://github.com/piwik/piwik/blob/3.x-dev/plugins/Live/Visitor.php#L309 it looks like 0,18 s

actionDetails

                ["actionDetails"]=>
                array(1) {
                  [0]=>
                  array(10) {
                    ["type"]=>
                    string(6) "action"
                    ["url"]=>
                    string(25) "http://www.example.com/"
                    ["pageTitle"]=>
                    string(81) "foobar"
                    ["pageIdAction"]=>
                    string(1) "2"
                    ["serverTimePretty"]=>
                    string(19) "22.12.2016 11:32:19"
                    ["pageId"]=>
                    string(5) "10751"
                    ["generationTime"]=>
                    string(6) "0,18 s"
                    ["interactionPosition"]=>
                    string(1) "1"
                    ["icon"]=>
                    NULL
                    ["timestamp"]=>
                    int(1482406339)
                  }
                }

i have the bug too, it happens if you click on a VisitorProfil.

Well done for working that out. I was only seeing this very occasionally, and I'd only ever had it when the thumbnail regenerates in my browser speeddial plugin. Copying the error message to this issue meant reading tiny text, and I couldn't reproduce it.

Now I can. You're quite right; here's how to reproduce this: Go to a site's dashboard, and click on the link to view a visitor profile (which opens in a lightbox). Then click on the "PIWIK" logo top-left of the screen, to return to your dashboard (showing all the sites you're tracking, not just the one you were previously in). You then get a warning DIV at the top of the page with the above error message in - one warning for every profile you visited. Refresh the page to reload the dashboard, and the message disappears (the warning is regarded as dismissed).

@kokspflanze @James-Oakley can you try replace these lines: https://github.com/piwik/piwik/blob/3.x-dev/plugins/Live/Visitor.php#L308-L310

by:

            } elseif ($actionDetail['custom_float'] > 0) {
                var_dump($actionDetail['custom_float']);
                $actionDetail['generationTime'] = $formatter->getPrettyTimeFromSeconds($actionDetail['custom_float'] / 1000, true);
            }

and then reproduce the issue which should display some string on top of the screen? what is the value displayed?

what is the value displayed?

float(604) float(366) float(65) float(67) float(66)

Found the issue I think, and should be fixed in https://github.com/piwik/piwik/pull/11095/files

Do you mind testing the patches to the two files and confirm it fixes the issue?

@mattab looks good from my site=)

+1

Patches applied successfully, and the issue appears to be resolved. :-)