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

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java.lang.NullPointerException:
at org.eclipse.xtext.ide.server.LanguageServerImpl.translateKind(LanguageServerImpl.java:466)
at org.eclipse.xtext.ide.server.LanguageServerImpl.toCompletionItem(LanguageServerImpl.java:458)
at org.eclipse.xtext.ide.server.LanguageServerImpl.lambda$null$39(LanguageServerImpl.java:433)
at com.google.common.collect.Iterators$8.transform(Iterators.java:817)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators.addAll(Iterators.java:365)
at com.google.common.collect.Lists.newArrayList(Lists.java:162)
at org.eclipse.xtext.ide.server.LanguageServerImpl.lambda$completion$40(LanguageServerImpl.java:436)
at org.eclipse.xtext.ide.server.concurrent.RequestManager.lambda$runRead$53(RequestManager.java:129)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

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