org.eclipse.emf.common.util.WrappedException: java.lang.NullPointerException

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java.lang.NullPointerException
org.eclipse.emf.common.util.WrappedException: java.lang.NullPointerException
at org.eclipse.xtext.linking.impl.LinkingHelper.getRuleNameFrom(LinkingHelper.java:41)
at org.eclipse.xtext.linking.impl.LinkingHelper.getCrossRefNodeAsString(LinkingHelper.java:56)
at org.osate.xtext.aadl2.properties.linking.PropertiesLinkingService.getCrossRefNodeAsString(PropertiesLinkingService.java:233)
at org.osate.xtext.aadl2.linking.Aadl2LinkingService.getLinkedObjects(Aadl2LinkingService.java:149)
at org.eclipse.xtext.linking.lazy.LazyLinkingResource.getEObject(LazyLinkingResource.java:250)
at org.eclipse.xtext.linking.lazy.LazyLinkingResource.getEObject(LazyLinkingResource.java:225)
at org.eclipse.xtext.resource.persistence.StorageAwareResource.getEObject(StorageAwareResource.java:136)
at org.osate.xtext.aadl2.ui.propertyview.CachePropertyLookupJob.lambda$0(CachePropertyLookupJob.java:114)
at org.osate.xtext.aadl2.ui.propertyview.AadlPropertyView.lambda$15(AadlPropertyView.java:2164)
at org.eclipse.xtext.resource.OutdatedStateManager.exec(OutdatedStateManager.java:121)
at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.internalReadOnly(XtextDocument.java:520)
at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:492)
at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:133)
at org.osate.xtext.aadl2.ui.propertyview.AadlPropertyView.safeRead(AadlPropertyView.java:2166)
at org.osate.xtext.aadl2.ui.propertyview.CachePropertyLookupJob.run(CachePropertyLookupJob.java:234)

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