diff --git a/projects/common-map/src/fm-map/services/temporal.service.ts b/projects/common-map/src/fm-map/services/temporal.service.ts
index 457c937..6d5a58a 100644
--- a/projects/common-map/src/fm-map/services/temporal.service.ts
+++ b/projects/common-map/src/fm-map/services/temporal.service.ts
@@ -14,9 +14,9 @@ export class TemporalService {
       }
     
       selectedDate(itemLayer:IItemLayer):string {
-        let temporalItemLayer = itemLayer as  ITemporalItemLayer;
-        if(temporalItemLayer.selectedItemLayer) {
-          if(temporalItemLayer.selectedItemLayer.item.dataDate && temporalItemLayer.selectedItemLayer.item.dataEndDate) {
+        let temporalItemLayer = itemLayer as  ITemporalItemLayer;        
+        if(temporalItemLayer && temporalItemLayer.selectedItemLayer) {
+          if(temporalItemLayer && temporalItemLayer.selectedItemLayer.item.dataDate && temporalItemLayer.selectedItemLayer.item.dataEndDate) {
             let sd = new Date(Date.parse(temporalItemLayer.selectedItemLayer.item.dataDate));
             let ed = new Date(Date.parse(temporalItemLayer.selectedItemLayer.item.dataEndDate));
             return this.timespanService$.getCaption(sd,ed);
@@ -30,7 +30,7 @@ export class TemporalService {
     
       nextDate(itemLayer:IItemLayer):string {
         let temporalItemLayer = itemLayer as  ITemporalItemLayer;
-        if(temporalItemLayer.nextItemLayer.item) {
+        if(temporalItemLayer && temporalItemLayer.nextItemLayer && temporalItemLayer.nextItemLayer.item) {
           if(temporalItemLayer.nextItemLayer.item.dataDate && temporalItemLayer.nextItemLayer.item.dataEndDate) {
             let sd = new Date(Date.parse(temporalItemLayer.nextItemLayer.item.dataDate));
             let ed = new Date(Date.parse(temporalItemLayer.nextItemLayer.item.dataEndDate));
@@ -50,7 +50,7 @@ export class TemporalService {
     
       previousDate(itemLayer:IItemLayer):string {
         let temporalItemLayer = itemLayer as  ITemporalItemLayer;
-        if(temporalItemLayer.previousItemLayer.item)  {
+        if(temporalItemLayer && temporalItemLayer.previousItemLayer && temporalItemLayer.previousItemLayer.item)  {
           if(temporalItemLayer.previousItemLayer.item.dataDate && temporalItemLayer.previousItemLayer.item.dataEndDate) {
             let sd = new Date(Date.parse(temporalItemLayer.previousItemLayer.item.dataDate));
             let ed = new Date(Date.parse(temporalItemLayer.previousItemLayer.item.dataEndDate));