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null at io.gatling.http.action.async.ws.WsListener.onError( WsListener.scala:5 0) at org.asynchttpclient.netty.ws.NettyWebSocket.onError( NettyWebSocket.ja va:152) at org.asynchttpclient.netty.handler.WebSocketHandler
java.lang.NullPointerException: null
         at io.gatling.http.action.async.ws.WsListener.onError(
 WsListener.scala:5
 0)
         at org.asynchttpclient.netty.ws.NettyWebSocket.onError(
 NettyWebSocket.ja
 va:152)
         at org.asynchttpclient.netty.handler.WebSocketHandler.
 handleException(We
 bSocketHandler.java:213)
         at org.asynchttpclient.netty.handler.AsyncHttpClientHandler.
 exceptionCau
 ght(AsyncHttpClientHandler.java:212)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeExceptionCaught(
 AbstractChannelHandlerContext.java:273)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeExceptionCaught(
 AbstractChannelHandlerContext.java:252)
         at io.netty.channel.AbstractChannelHandlerContext.
 fireExceptionCaught(Ab
 stractChannelHandlerContext.java:244)
         at io.netty.channel.ChannelInboundHandlerAdapter.
 exceptionCaught(Channel
 InboundHandlerAdapter.java:131)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeExceptionCaught(
 AbstractChannelHandlerContext.java:273)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeExceptionCaught(
 AbstractChannelHandlerContext.java:252)
         at io.netty.channel.AbstractChannelHandlerContext.
 fireExceptionCaught(Ab
 stractChannelHandlerContext.java:244)
         at io.netty.channel.ChannelInboundHandlerAdapter.
 exceptionCaught(Channel
 InboundHandlerAdapter.java:131)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeExceptionCaught(
 AbstractChannelHandlerContext.java:273)
         at io.netty.channel.AbstractChannelHandlerContext.
 notifyHandlerException
 (AbstractChannelHandlerContext.java:831)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeChannelRead(Abst
 ractChannelHandlerContext.java:344)
         at io.netty.channel.AbstractChannelHandlerContext.
 invokeChannelRead(Abst
 ractChannelHandlerContext.java:328)
         at io.netty.channel.AbstractChannelHandlerContext.
 fireChannelRead(Abstra
 ctChannelHandlerContext.java:321)	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1070)	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:904)