1 exception(s):
Exception #0 (InvalidArgumentException): Unable to serialize value. Error: Malformed UTF-8 characters, possibly incorrectly encoded

Exception #0 (InvalidArgumentException): Unable to serialize value. Error: Malformed UTF-8 characters, possibly incorrectly encoded
<pre>#1 MagentoFrameworkAppPageCacheKernel->process(&MagentoFrameworkAppResponseHttpInterceptor#000000003982af7000000000142eda42#) called at [vendor/magento/module-page-cache/Model/Controller/Result/BuiltinPlugin.php:96]
#2 MagentoPageCacheModelControllerResultBuiltinPlugin->afterRenderResult(&MGSMpanelBlockFrameworkPageInterceptor#000000003982abaf00000000142eda42#, &MGSMpanelBlockFrameworkPageInterceptor#000000003982abaf00000000142eda42#, &MagentoFrameworkAppResponseHttpInterceptor#000000003982af7000000000142eda42#) called at [vendor/magento/framework/Interception/Interceptor.php:146]
#3 MGSMpanelBlockFrameworkPageInterceptor->MagentoFrameworkInterception{closure}(&MagentoFrameworkAppResponseHttpInterceptor#000000003982af7000000000142eda42#) called at [vendor/magento/framework/Interception/Interceptor.php:153]
#4 MGSMpanelBlockFrameworkPageInterceptor->___callPlugins('renderResult', array(&MagentoFrameworkAppResponseHttpInterceptor#000000003982af7000000000142eda42#), array(array('result-messages', 'result-builtin-c...', 'result-varnish-c...'))) called at [generated/code/MGS/Mpanel/Block/Framework/Page/Interceptor.php:156]
#5 MGSMpanelBlockFrameworkPageInterceptor->renderResult(&MagentoFrameworkAppResponseHttpInterceptor#000000003982af7000000000142eda42#) called at [vendor/magento/framework/App/Http.php:140]
#6 MagentoFrameworkAppHttp->launch() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:24]
#7 MagentoFrameworkAppHttpInterceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:258]
#8 MagentoFrameworkAppBootstrap->run(&MagentoFrameworkAppHttpInterceptor#000000003982af7e00000000142eda42#) called at [index.php:39]