diff --git a/i18n/en-US.json b/i18n/en-US.json
index 372d2cf..fdf8f93 100644
--- a/i18n/en-US.json
+++ b/i18n/en-US.json
@@ -88,7 +88,9 @@
 			"mainMenu": "Main Menu (Open hours)",
 			"voicemails": "Voicemail Boxes",
 			"users": "Users"
-		}
+		},
+		"__comment": "UI-819, v3.19_s1: Showing an error popup when group data is outdated.",
+		"outdatedGroupsError": "Your User Groups data is outdated and can not be rendered. Please contact your administrator to update your data."
 	},
 
 	"devices": {
diff --git a/i18n/fr-FR.json b/i18n/fr-FR.json
index f76c5e8..a102a41 100644
--- a/i18n/fr-FR.json
+++ b/i18n/fr-FR.json
@@ -88,7 +88,9 @@
 			"mainMenu": "Menu principal",
 			"voicemails": "Répondeurs",
 			"users": "Utilisateurs"
-		}
+		},
+		"__comment": "UI-819, v3.19_s1: Showing an error popup when group data is outdated.",
+		"outdatedGroupsError": "Les données de vos Groupes sont obsolètes et ne peuvent être affichées. Veuillez contacter votre administrateur afin de mettre à jour vos données."
 	},
 
 	"devices": {
diff --git a/submodules/groups/groups.js b/submodules/groups/groups.js
index a28fadc..5abb9fe 100644
--- a/submodules/groups/groups.js
+++ b/submodules/groups/groups.js
@@ -26,38 +26,46 @@ define(function(require){
 			self.groupsRemoveOverlay();
 
 			self.groupsGetData(function(data) {
-				var dataTemplate = self.groupsFormatListData(data),
-					template = $(monster.template(self, 'groups-layout', { countGroups: Object.keys(dataTemplate.groups).length })),
-					templateGroup;
+				var hasOldData = _.find(data.callflows, function(callflow) {
+					return !callflow.hasOwnProperty('type');
+				});
 
-				_.each(dataTemplate.groups, function(group) {
-					templateGroup = monster.template(self, 'groups-row', group);
+				if(hasOldData) {
+					monster.ui.alert('error', self.i18n.active().groups.outdatedGroupsError);
+				} else {
+					var dataTemplate = self.groupsFormatListData(data),
+						template = $(monster.template(self, 'groups-layout', { countGroups: Object.keys(dataTemplate.groups).length })),
+						templateGroup;
 
-					template.find('.groups-rows').append(templateGroup);
-				});
+					_.each(dataTemplate.groups, function(group) {
+						templateGroup = monster.template(self, 'groups-row', group);
 
-				self.groupsBindEvents(template, parent);
+						template.find('.groups-rows').append(templateGroup);
+					});
 
-				parent
-					.empty()
-					.append(template);
+					self.groupsBindEvents(template, parent);
 
-				if(_groupId) {
-					var cells =  parent.find('.grid-row[data-id=' + _groupId + '] .grid-cell');
+					parent
+						.empty()
+						.append(template);
 
-					monster.ui.fade(cells);
-				}
+					if(_groupId) {
+						var cells =  parent.find('.grid-row[data-id=' + _groupId + '] .grid-cell');
 
-				for (var group in dataTemplate.groups) {
-					noGroup = ( typeof dataTemplate.groups[group] === 'undefined' ) ? true : false;
-				}
+						monster.ui.fade(cells);
+					}
 
-				if ( noGroup ) {
-					parent.find('.grid-row.title').css('display', 'none');
-					parent.find('.no-groups-row').css('display', 'block');
-				} else {
-					parent.find('.grid-row.title').css('display', 'block');
-					parent.find('.no-groups-row').css('display', 'none');
+					for (var group in dataTemplate.groups) {
+						noGroup = ( typeof dataTemplate.groups[group] === 'undefined' ) ? true : false;
+					}
+
+					if ( noGroup ) {
+						parent.find('.grid-row.title').css('display', 'none');
+						parent.find('.no-groups-row').css('display', 'block');
+					} else {
+						parent.find('.grid-row.title').css('display', 'block');
+						parent.find('.no-groups-row').css('display', 'none');
+					}
 				}
 			});
 		},