Warning: htmlspecialchars(): Invalid multibyte sequence in argument in stats/piwik/core/SmartyPlugins/modifier.escape.php on line 31 #3859

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]

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?

Smarty errors are not applicable now that we use Twig

See similar bug in Twig #4330

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