java.lang.ArrayIndexOutOfBoundsException: -1

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java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:368)
at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:377)
at undefined.PlanNodeImpl.getChildAt(PlanNodeImpl.java:74)
at org.icefaces.ace.model.tree.ListNodeDataModel.navToChild(ListNodeDataModel.java:127)
at org.icefaces.ace.model.tree.ListNodeDataModel.navToChild(ListNodeDataModel.java:24)
at org.icefaces.ace.component.tree.Tree.setNodeToChild(Tree.java:178)
at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:880)
at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:881)
at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:881)
at org.icefaces.ace.component.tree.Tree.iterateTreeLevel(Tree.java:881)
at org.icefaces.ace.component.tree.Tree.iterate(Tree.java:822)
at org.icefaces.ace.component.tree.Tree.processValidators(Tree.java:348)

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