diff --git a/app/assets/javascripts/app/controllers/ticket_overview.coffee b/app/assets/javascripts/app/controllers/ticket_overview.coffee
index a5083ccbc..c7f3ae44d 100644
--- a/app/assets/javascripts/app/controllers/ticket_overview.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_overview.coffee
@@ -424,11 +424,13 @@ class Table extends App.Controller
         attribute.link = object.uiUrl()
         value
       callbackUserPopover = (value, object, attribute, attributes, refObject) ->
+        return value if !refObject
         attribute.class = 'user-popover'
         attribute.data =
           id: refObject.id
         value
       callbackOrganizationPopover = (value, object, attribute, attributes, refObject) ->
+        return value if !refObject
         attribute.class = 'organization-popover'
         attribute.data =
           id: refObject.id
diff --git a/app/assets/javascripts/app/controllers/widget/ticket_list.coffee b/app/assets/javascripts/app/controllers/widget/ticket_list.coffee
index 6856df871..8118af319 100644
--- a/app/assets/javascripts/app/controllers/widget/ticket_list.coffee
+++ b/app/assets/javascripts/app/controllers/widget/ticket_list.coffee
@@ -16,11 +16,13 @@ class App.TicketList extends App.Controller
       attribute.link = object.uiUrl()
       value
     callbackUserPopover = (value, object, attribute, attributes, refObject) ->
+      return value if !refObject
       attribute.class = 'user-popover'
       attribute.data =
         id: refObject.id
       value
     callbackOrganizationPopover = (value, object, attribute, attributes, refObject) ->
+      return value if !refObject
       attribute.class = 'organization-popover'
       attribute.data =
         id: refObject.id