"Array to string conversion" problem in Piwik 2.8.3 (no replies)

Hello,

since update to 2.8.3 the ecommerce visitor protocol on the ecommerce page do not show the visitors data anymore.

Instead, there is a notice:

Notice:Array to string conversion in /home/sites/mydomain.net/subdomains/shop/piwik/tmp/templates_c/ba/ce/7fde9185ff42055539941c3b583631e73a0b08821a97c3db94721f791a80.php on line 87

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/tmp/templates_c/ba/ce/7fde9185ff42055539941c3b583631e73a0b08821a97c3db94721f791a80.php:87]
#1 __TwigTemplate_bace7fde9185ff42055539941c3b583631e73a0b08821a97c3db94721f791a80->doDisplay(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:279]
#2 Twig_Template->displayWithErrorHandling(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:253]
#3 Twig_Template->display(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/tmp/templates_c/ec/fd/542b102c9bbb13da12311596f06049e870929c22c283b03a44bcc1254f8a.php:138]
#4 __TwigTemplate_ecfd542b102c9bbb13da12311596f06049e870929c22c283b03a44bcc1254f8a->doDisplay(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:279]
#5 Twig_Template->displayWithErrorHandling(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:253]
#6 Twig_Template->display(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/tmp/templates_c/be/da/1f9d769de757e098c3062bc888b74e8fff574bdec01bf9f7febf2783fa5a.php:115]
#7 __TwigTemplate_beda1f9d769de757e098c3062bc888b74e8fff574bdec01bf9f7febf2783fa5a->doDisplay(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:279]
#8 Twig_Template->displayWithErrorHandling(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:253]
#9 Twig_Template->display(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Template.php:264]
#10 Twig_Template->render(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/vendor/twig/twig/lib/Twig/Environment.php:292]
#11 Twig_Environment->render(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/View.php:259]
#12 Piwik\View->renderTwigTemplate(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/View.php:253]
#13 Piwik\View->render(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/Plugin/ViewDataTable.php:415]
#14 Piwik\Plugin\ViewDataTable->render(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/Plugin/Report.php:304]
#15 Piwik\Plugin\Report->render(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/Plugin/Controller.php:327]
#16 Piwik\Plugin\Controller->renderReport(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/plugins/Live/Controller.php:70]
#17 Piwik\Plugins\Live\Controller->getVisitorLog(...) called at [:]
#18 call_user_func_array(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/FrontController.php:587]
#19 Piwik\FrontController->doDispatch(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/FrontController.php:95]
#20 Piwik\FrontController->dispatch(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/plugins/Goals/Controller.php:109]
#21 Piwik\Plugins\Goals\Controller->getEcommerceLog(...) called at [:]
#22 call_user_func_array(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/FrontController.php:587]
#23 Piwik\FrontController->doDispatch(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/FrontController.php:95]
#24 Piwik\FrontController->dispatch(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/core/dispatch.php:34]
#25 require_once(...) called at [/home/sites/mydomain.net/subdomains/shop/piwik/index.php:46]

What to do now?

Best regards, fibergirl

Additional info:
This happens only if ecommerce count = 0.
For example on Monday morning, if statistics are displayed weekly.
As soon there is the first ecommerce transactions count != 0, the ecommerce visitors protocol starts appearing normal.