GuzzleHttp\Exception\InvalidArgumentException: XenForo upgrade check failed: Unexpected result, starting 'error code: 520 ' // json_decode error: Syntax error
src/vendor/guzzlehttp/guzzle/src/Utils.php:277
Stack trace
#0 src/XF/Service/Upgrade/CheckerService.php(98): GuzzleHttp\Utils::jsonDecode('error code: 520...', true)
#1 src/XF/Admin/Controller/ToolsController.php(436): XF\Service\Upgrade\CheckerService->check()
#2 src/XF/Mvc/Dispatcher.php(364): XF\Admin\Controller\ToolsController->actionUpgradeCheck(Object(XF\Mvc\ParameterBag))
#3 src/XF/Mvc/Dispatcher.php(266): XF\Mvc\Dispatcher->dispatchClass('XF:Tools', 'UpgradeCheck', Object(XF\Mvc\RouteMatch), Object(Wutime\AdBlockTracker\XF\Admin\Controller\Tools), NULL)
#4 src/XF/Mvc/Dispatcher.php(121): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(Wutime\AdBlockTracker\XF\Admin\Controller\Tools), NULL)
#5 src/XF/Mvc/Dispatcher.php(63): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#6 src/XF/App.php(2830): XF\Mvc\Dispatcher->run()
#7 src/XF.php(850): XF\App->run()
#8 admin.php(15): XF::runApp('XF\\Admin\\App')
#9 {main}