java.lang.ArrayIndexOutOfBoundsException: -1

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java.lang.ArrayIndexOutOfBoundsException: -1
at hex.gbm.DTree$TreeModel.cm(DTree.java:566)
at hex.GridSearch$GridSearchProgress.toHTML(GridSearch.java:98)
at water.api.RequestBuilders.build(RequestBuilders.java:68)
at water.api.Request.serveGrid(Request.java:148)
at water.Request2.superServeGrid(Request2.java:466)
at water.Request2.serveGrid(Request2.java:387)
at water.api.Request.serve(Request.java:117)
at water.api.RequestServer.serve(RequestServer.java:247)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:421)
at java.lang.Thread.run(Thread.java:744)

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