notification webhook fail?

[icezhaoL]

See the log!

2021-07-28 09:11:43,584 [] ERROR [alpine.event.framework.LoggableUncaughtExceptionHandler] An unknown error occurred in an asynchronous event or notification thread
java.lang.NullPointerException: Value in JsonObjects name/value pair cannot be null
at org.glassfish.json.JsonObjectBuilderImpl.validateValue(JsonObjectBuilderImpl.java:222)
at org.glassfish.json.JsonObjectBuilderImpl.add(JsonObjectBuilderImpl.java:90)
at org.dependencytrack.util.NotificationUtil.toJson(NotificationUtil.java:303)
at org.dependencytrack.notification.publisher.Publisher.prepareTemplate(Publisher.java:84)
at org.dependencytrack.notification.publisher.AbstractWebhookPublisher.publish(AbstractWebhookPublisher.java:40)
at org.dependencytrack.notification.publisher.WebhookPublisher.inform(WebhookPublisher.java:32)
at org.dependencytrack.notification.NotificationRouter.inform(NotificationRouter.java:63)
at alpine.notification.NotificationService.lambda$alertSubscriber$0(NotificationService.java:100)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)