Context

See below error details

Error: {"message":"htmlspecialchars_decode(): Argument #1 ($string) must be of type string, array given","file":"core/Common.php","line":422,"request_id":"3bc2b","backtrace":" on core/Common.php(422)\n#0 core/Common.php(422): htmlspecialchars_decode(Array, 3)\n#1 plugins/Transitions/API.php(165): Piwik\Common::unsanitizeInputValue(Array)\n#2 plugins/Transitions/API.php(79): Piwik\Plugins\Transitions\API->deriveIdAction(Array, 'url')\n#3 [internal function]: Piwik\Plugins\Transitions\API->getTransitionsForAction(Array, 'url', '1', 'day', 'yesterday', false, 0, 'all')\n#4 core/API/Proxy.php(244): call_user_func_array(Array, Array)\n#5 core/Context.php(28): Piwik\API\Proxy->Piwik\API\{closure}()\n#6 core/API/Proxy.php(335): Piwik\Context::executeWithQueryParameters(Array, Object(Closure))\n#7 core/API/Request.php(267): Piwik\API\Proxy->call('\\Piwik\\Plugins\\...', 'getTransitionsF...', Array)\n#8 plugins/API/Controller.php(45): Piwik\API\Request->process()\n#9 [internal function]: Piwik\Plugins\API\Controller->index()\n#10 core/FrontController.php(637): call_user_func_array(Array, Array)\n#11 core/FrontController.php(169): Piwik\FrontController->doDispatch('API', false, Array)\n#12 core/dispatch.php(32): Piwik\FrontController->dispatch()\n#13 index.php(25): require_once('c...')\n#14 {main}","safemode_backtrace":"#0 [internal function]: Piwik\Plugins\Cloud\Controller->safemode(Array)\n#1 /core/FrontController.php(637)

URL: /index.php?module=API&method=Transitions.getTransitionsForAction&actionType=url&actionName[]=https%3A%2F%2Fwww.matomo.org%2Fde%2Fbar%2Ffoo%2F&idSite=1&period=day&date=yesterday&format=JSON&token_auth=XYZANONYMIZED&force_api_session=1

Referrer: None

GET: {"module":"API","method":"Transitions.getTransitionsForAction","actionType":"url","actionName":["https://www.matomo.org/de/bar/foo/"],"idSite":"1","period":"day","date":"yesterday","format":"JSON","token_auth":"XYZANONYMIZED","force_api_session":"1","filter_limit":100}

Expected Behavior

No fatal error

Current Behavior

Fatal error occurs

Your Environment

Latest Matomo version