Index: lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/web/controller/LearningController.java
===================================================================
diff -u -r10eba877611a9296e5959e3145b626771a844593 -rbdd3abc4e8371ce227cb000d5aac58fdb45077a5
--- lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/web/controller/LearningController.java	(.../LearningController.java)	(revision 10eba877611a9296e5959e3145b626771a844593)
+++ lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/web/controller/LearningController.java	(.../LearningController.java)	(revision bdd3abc4e8371ce227cb000d5aac58fdb45077a5)
@@ -1145,19 +1145,6 @@
 	request.setAttribute("sessions", sessionList);
 
 	Map<Long, QuestionSummary> questionSummaries = service.getQuestionSummaryForExport(assessment);
-
-	// filter out empty results, when a group has not provided any answers
-	for (QuestionSummary questionSummary : questionSummaries.values()) {
-	    Iterator<List<AssessmentQuestionResult>> questionResultsIterator = questionSummary
-		    .getQuestionResultsPerSession().iterator();
-	    while (questionResultsIterator.hasNext()) {
-		List<AssessmentQuestionResult> questionResults = questionResultsIterator.next();
-		if (questionResults == null || questionResults.isEmpty()
-			|| questionResults.get(questionResults.size() - 1).getUid() == null) {
-		    questionResultsIterator.remove();
-		}
-	    }
-	}
 	request.setAttribute("questionSummaries", questionSummaries);
 
 	// Assessment currently supports only one place for ratings.
@@ -1186,6 +1173,7 @@
 	// Item IDs are AssessmentQuestionResults UIDs, i.e. a user answer for a particular question
 	// Get all item IDs no matter which session they belong to.
 	Set<Long> itemIds = questionSummaries.values().stream().flatMap(s -> s.getQuestionResultsPerSession().stream())
+		.filter(l -> l != null && !l.isEmpty() && l.get(l.size() - 1).getUid() != null)
 		.collect(Collectors.mapping(l -> l.get(l.size() - 1).getUid(), Collectors.toSet()));
 
 	List<ItemRatingDTO> itemRatingDtos = ratingService.getRatingCriteriaDtos(assessment.getContentId(), null,
@@ -1208,12 +1196,13 @@
 		    List<AssessmentQuestionResult> questionResults = questionResultsPerSession
 			    .remove((int) userSessionIndex);
 
-		    // user or his leader should rate all other groups' answers in order to show ratings left for own group
-		    int expectedRatedItemCount = questionResults.size();
-
 		    Set<Long> questionItemIds = questionResultsPerSession.stream()
+			    .filter(l -> l != null && !l.isEmpty() && l.get(l.size() - 1).getUid() != null)
 			    .collect(Collectors.mapping(l -> l.get(l.size() - 1).getUid(), Collectors.toSet()));
 
+		    // user or his leader should rate all other groups' answers in order to show ratings left for own group
+		    int expectedRatedItemCount = questionItemIds.size();
+
 		    // question results need to be in the same order as sessions, i.e. user group first
 		    questionResultsPerSession.add(0, questionResults);
 
Index: lams_tool_assessment/web/pages/learning/results/essay.jsp
===================================================================
diff -u -r10eba877611a9296e5959e3145b626771a844593 -rbdd3abc4e8371ce227cb000d5aac58fdb45077a5
--- lams_tool_assessment/web/pages/learning/results/essay.jsp	(.../essay.jsp)	(revision 10eba877611a9296e5959e3145b626771a844593)
+++ lams_tool_assessment/web/pages/learning/results/essay.jsp	(.../essay.jsp)	(revision bdd3abc4e8371ce227cb000d5aac58fdb45077a5)
@@ -42,8 +42,17 @@
 				<c:set var="sessionResults" 
 					value="${questionSummary.questionResultsPerSession[status.index]}" />
 				<c:set var="sessionResults" value="${sessionResults[fn:length(sessionResults)-1]}" />
-				<c:set var="answer" value="${sessionResults.answer}" />
-				<c:set var="itemRatingDto" value="${itemRatingDtos[sessionResults.uid]}" />
+				<c:choose>
+					<%-- If uid is NULL then it is a dummy session result, for a group that has not provided answers
+						 Do not display the group's rating then --%>
+					<c:when test="${empty sessionResults.uid}">
+						<c:set var="sessionResults" value="" />
+					</c:when>
+					<c:otherwise>
+						<c:set var="answer" value="${sessionResults.answer}" />
+						<c:set var="itemRatingDto" value="${itemRatingDtos[sessionResults.uid]}" />
+					</c:otherwise>
+				</c:choose>
 				<c:set var="canRate" value="${toolSessionID != session.sessionId and (!isLeadershipEnabled or isUserLeader)}" />
 				<c:set var="showRating" 
 					value="${canRate or (not empty itemRatingDto.commentDtos and (toolSessionID != session.sessionId or questionSummary.showOwnGroupRating))}" />