Strange websocket status

Hi, on my server i have found a websocket with a status open but when i try to write on i get this exception : java.lang.IllegalStateException: The remote endpoint was in state [TEXT_PARTIAL_WRITING] which is an invalid state for called method at

[TOMCAT 7] ErrorReport Vavle showError attribute not used ?

Hello, i try to disable stack trace on my tomcat 7.52 server, i found on the doc that i can do it by configure an errorReportValve class and put showError attribute to false. so i add this line in the good part of server.xml Valve className=org.apache.catalina.valves.ErrorReportValve