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

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java.lang.NullPointerException:
at org.polymap.core.project.ILayer.lambda$0(ILayer.java:56)
at java.util.Collections$ReverseComparator2.compare(Collections.java:5178)
at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
at java.util.TimSort.sort(TimSort.java:220)
at java.util.Arrays.sort(Arrays.java:1512)
at java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:348)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.polymap.core.project.ui.ProjectNodeContentProvider.getChildren(ProjectNodeContentProvider.java:53)

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