java.lang.NullPointerException: This exception has no message.

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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)

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