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java.lang.NullPointerException: 	at io.mycat.server.handler.ServerPrepareHandler.prepareStmtBindValue(ServerPrepareHandler.java:187)	at io.mycat.server.handler.ServerPrepareHandler.execute(ServerPrepareHandler.java:93)	at io.mycat.net.FrontendConnection.stmtExecute(FrontendConnection.java:370)	at io.mycat.net.handler.FrontendCommandHandler.handle(FrontendCommandHandler.java:91)	at io.mycat.net.FrontendConnection.rawHandle(FrontendConnection.java:462)	at io.mycat.net.FrontendConnection.handle(FrontendConnection.java:444)	at io.mycat.net.AbstractConnection.onReadData(AbstractConnection.java:321)	at io.mycat.net.NIOSocketWR.asynRead(NIOSocketWR.java:190)	at io.mycat.net.AbstractConnection.asynRead(AbstractConnection.java:273)	at io.mycat.net.NIOReactor$RW.run(NIOReactor.java:102)	at java.lang.Thread.run(Unknown Source)