candyleer commented on issue #2657: class[class org.apache.catalina.core.StandardHostValve] after method[invoke] intercept failure java.lang.NullPointerException URL: https://github.com/apache/skywalking/issues/2657#issuecomment-513543824 Based on the above information, cannot reproduce the error,from the error log ,the threadlocal `get()->CONTEXT` may be null in that moment,I think maybe some previous `ContextManager.stop` in other plugin may have make the `activeSpanStack` empty. 
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