I have updated from 1.11.1 to the Git tag 1.12-b6. When I download an eMail report I get following error message:
Notice: Undefined index: nb_visits_22 in /srv/.../piwik_git/plugins/ImageGraph/API.php on line 401 Backtrace --> #0 Piwik_ErrorHandler(...) called at [/srv/.../piwik_git/plugins/ImageGraph/API.php:401] #1 Piwik_ImageGraph_API->get(...) called at [:] #2 call_user_func_array(...) called at [/srv/.../piwik_git/core/API/Proxy.php:187] #3 Piwik_API_Proxy->call(...) called at [/srv/.../piwik_git/core/API/Request.php:121] #4 Piwik_API_Request->process(...) called at [/srv/.../piwik_git/core/ReportRenderer.php:237] #5 Piwik_ReportRenderer::getStaticGraph(...) called at [/srv/.../piwik_git/core/ReportRenderer/Html.php:141] #6 Piwik_ReportRenderer_Html->renderReport(...) called at [:] #7 array_walk(...) called at [/srv/.../piwik_git/plugins/PDFReports/API.php:418] #8 Piwik_PDFReports_API->generateReport(...) called at [:] #9 call_user_func_array(...) called at [/srv/.../piwik_git/core/API/Proxy.php:187] #10 Piwik_API_Proxy->call(...) called at [/srv/.../piwik_git/core/API/Request.php:121] #11 Piwik_API_Request->process(...) called at [/srv/.../piwik_git/plugins/API/Controller.php:25] #12 Piwik_API_Controller->index(...) called at [:] #13 call_user_func_array(...) called at [/srv/.../piwik_git/core/FrontController.php:125] #14 Piwik_FrontController->dispatch(...) called at [/srv/.../piwik_git/index.php:47]