Duncan-tree-zhou commented on issue #2836: get http 500 error when sending a span without "kind" attribute to zipkin receiver URL: https://github.com/apache/skywalking/issues/2836#issuecomment-504261758 ref : [SpanForward.java](https://github.com/apache/skywalking/blob/master/oap-server/server-receiver-plugin/zipkin-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/zipkin/trace/SpanForward.java) the problem still exists in latest code. check [zipkin-api](https://zipkin.io/zipkin-api/#/). the attribute "kind" can be null. While in Skywalking zipkin receiver, it's forced to be not null.
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