Merge pull request #4895 from inception-project/bugfix/4891-Exception…

…-in-sidebar-curation-mode-when-document-level-annotations-exist

#4891 - Exception in sidebar curation mode when document-level annotations exist

inception/inception-ui-curation/src/main/java/de/tudarmstadt/ukp/inception/ui/curation/sidebar/render/CurationSidebarRenderer.java

@@ -33,6 +33,7 @@
 
 import org.apache.uima.cas.CAS;
 import org.apache.uima.cas.text.AnnotationFS;
+import org.apache.uima.jcas.tcas.Annotation;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.core.annotation.Order;
@@ -168,6 +169,10 @@ public void render(VDocument aVdoc, RenderRequest aRequest)
 
             for (var cfg : cfgSet.getConfigurations()) {
                 var fs = cfg.getRepresentative(casDiff.getCasMap());
+                if (!(fs instanceof Annotation)) {
+                    continue;
+                }
+
                 var user = cfg.getRepresentativeCasGroupId();
 
                 // We need to pass in *all* the annotation features here because we also to that in