Index: lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/service/AssessmentServiceImpl.java
===================================================================
diff -u -rd3f7b720d7995e28b2e7516272b0e14ed89c45bc -rac8d72126e5c0f76d0cb23eb5d66a7bd4f213268
--- lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/service/AssessmentServiceImpl.java	(.../AssessmentServiceImpl.java)	(revision d3f7b720d7995e28b2e7516272b0e14ed89c45bc)
+++ lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/service/AssessmentServiceImpl.java	(.../AssessmentServiceImpl.java)	(revision ac8d72126e5c0f76d0cb23eb5d66a7bd4f213268)
@@ -25,6 +25,7 @@
 
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
+import java.nio.charset.StandardCharsets;
 import java.security.InvalidParameterException;
 import java.sql.Timestamp;
 import java.time.LocalDateTime;
@@ -139,6 +140,7 @@
 import org.lamsfoundation.lams.util.excel.ExcelCell;
 import org.lamsfoundation.lams.util.excel.ExcelRow;
 import org.lamsfoundation.lams.util.excel.ExcelSheet;
+import org.springframework.web.util.UriUtils;
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
@@ -201,9 +203,9 @@
 
     public AssessmentServiceImpl() {
 	FluxRegistry.initFluxMap(AssessmentConstants.COMPLETION_CHARTS_UPDATE_FLUX_NAME,
-		AssessmentConstants.ANSWERS_UPDATED_SINK_NAME, null,
-		(Long toolContentId) -> getCompletionChartsData(toolContentId), FluxMap.SHORT_THROTTLE,
-		FluxMap.STANDARD_TIMEOUT);
+		AssessmentConstants.ANSWERS_UPDATED_SINK_NAME, null, (Long toolContentId) -> UriUtils
+			.encode(getCompletionChartsData(toolContentId), StandardCharsets.UTF_8.toString()),
+		FluxMap.SHORT_THROTTLE, FluxMap.STANDARD_TIMEOUT);
     }
 
     // *******************************************************************************
Index: lams_tool_assessment/web/pages/tblmonitoring/iraAssessmentStudentChoices.jsp
===================================================================
diff -u -rf619aa5955dca265aae7744ea3319f3ec468801e -rac8d72126e5c0f76d0cb23eb5d66a7bd4f213268
--- lams_tool_assessment/web/pages/tblmonitoring/iraAssessmentStudentChoices.jsp	(.../iraAssessmentStudentChoices.jsp)	(revision f619aa5955dca265aae7744ea3319f3ec468801e)
+++ lams_tool_assessment/web/pages/tblmonitoring/iraAssessmentStudentChoices.jsp	(.../iraAssessmentStudentChoices.jsp)	(revision ac8d72126e5c0f76d0cb23eb5d66a7bd4f213268)
@@ -51,7 +51,7 @@
 			if (!event.data) {
 				return;
 			}
-			var data = JSON.parse(event.data);
+			var data = JSON.parse(decodeURIComponent(event.data));
 			drawActivityCompletionChart(data, true);
 			drawAnsweredQuestionsChart(data, ${groupsInAnsweredQuestionsChart}, true);