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

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java.lang.NullPointerException:
at water.api.RF$RFColumnSelect.queryComment(RF.java:189)
at water.api.RequestArguments$Argument.query(RequestArguments.java:298)
at water.api.RequestQueries.buildQuery(RequestQueries.java:191)
at water.api.RequestQueries.checkArguments(RequestQueries.java:40)
at water.api.Request.serve(Request.java:105)
at water.api.RequestServer.serve(RequestServer.java:181)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:391)
at java.lang.Thread.run(Thread.java:724)

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