Warning: htmlspecialchars(): Invalid multibyte sequence in argument in stats/piwik/core/SmartyPlugins/modifier.escape.php on line 31

[micw]

This one is similar to the one reported in #3259 but in a different location. Occured after upgrading to 1.11.1 with mouseover to "Ziele" (last menu on dashboard, "Goals"?)
#0 Piwik_ErrorHandler(...) called at [:]
#1 htmlspecialchars(...) called at [/.../stats/piwik/core/SmartyPlugins/modifier.escape.php:31]
#2 smarty_modifier_escape(...) called at [/.../stats/piwik/tmp/templates_c/%%A6^A64^A64C33FC%%menu.tpl.php:25]
#3 include(...) called at [/.../stats/piwik/libs/Smarty/Smarty.class.php:1869]
#4 Smarty->_smarty_include(...) called at [/.../stats/piwik/tmp/templates_c/%%77^771^77160059%%index.tpl.php:13]
#5 include(...) called at [/.../stats/piwik/libs/Smarty/Smarty.class.php:1263]
#6 Smarty->fetch(...) called at [/.../stats/piwik/core/View.php:127]
#7 Piwik_View->render(...) called at [/.../stats/piwik/plugins/CoreHome/Controller.php:95]
#8 Piwik_CoreHome_Controller->index(...) called at [:]
#9 call_user_func_array(...) called at [/.../stats/piwik/core/FrontController.php:136]
#10 Piwik_FrontController->dispatch(...) called at [/.../stats/piwik/index.php:52]

[mattab]

Thanks for the report, but we need more info, how to replicate such problem?

Is it related to Goals, or particular tracking data creating this bug?

[mattab]

Smarty errors are not applicable now that we use Twig

[mattab]

See similar bug in Twig #4330

[mattab]

Invalid multibyte sequence in argument in /html/piwik/vendor/twig/twig/lib/Twig/Extension/Core.php on line 927

This bug has occurred again in Piwik 2.2.2. I created ticket at #5157