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java.lang.NullPointerException: 	at org.polymap.core.project.ILayer.lambda$0(	at java.util.Collections$	at java.util.TimSort.countRunAndMakeAscending(	at java.util.TimSort.sort(	at java.util.Arrays.sort(	at$SizedRefSortingSink.end(	at	at	at$ReduceOp.evaluateSequential(	at	at	at org.polymap.core.project.ui.ProjectNodeContentProvider.getChildren(