TypeError in WebhookIncoming Class

[hafriz]

hi, i have error in my log when accessing the webhook URL anyone know how to fix it?

[STDERR] TypeError: erLhcoreClassChatWebhookIncoming::processEvent(): Argument #2 ($payload) must be of type array, null given, called in /web/livechat/lhc_web/modules/lhwebhooks/incoming.php on line 59 and defined in /web/livechat/lhc_web/lib/core/lhchat/lhchatwebhookincomming.php:7
Stack trace:
#0 /web/livechat/lhc_web/modules/lhwebhooks/incoming.php(59): erLhcoreClassChatWebhookIncoming::processEvent()
#1 /web/livechat/lhc_web/lib/core/lhcore/lhmodule.php(108): include('...')
#2 /web/livechat/lhc_web/lib/core/lhcore/lhmodule.php(670): erLhcoreClassModule::runModule()
#3 /web/livechat/lhc_web/index.php(51): erLhcoreClassModule::moduleInit()
#4 {main}