diff --git a/lib/sessions/backend/ticket_overview_list.rb b/lib/sessions/backend/ticket_overview_list.rb
index ab91f19d0..ba07bdfae 100644
--- a/lib/sessions/backend/ticket_overview_list.rb
+++ b/lib/sessions/backend/ticket_overview_list.rb
@@ -75,9 +75,9 @@ class Sessions::Backend::TicketOverviewList < Sessions::Backend::Base
       assets = {}
       overview = Overview.lookup(id: index[:overview][:id])
       meta = {
-        name:  overview.name,
-        prio:  overview.prio,
-        link:  overview.link,
+        name: overview.name,
+        prio: overview.prio,
+        link: overview.link,
         count: index[:count],
       }
       indexes.push meta
@@ -86,7 +86,7 @@ class Sessions::Backend::TicketOverviewList < Sessions::Backend::Base
       @client.log "push overview_index for user #{@user.id}"
       @client.send(
         event: 'ticket_overview_index',
-        data:  indexes,
+        data: indexes,
       )
     end
 
@@ -110,6 +110,7 @@ class Sessions::Backend::TicketOverviewList < Sessions::Backend::Base
         next if !asset_needed_by_updated_at?('Ticket', ticket_meta[:id], ticket_meta[:updated_at])
 
         ticket = Ticket.lookup(id: ticket_meta[:id])
+        next if !ticket
         assets = asset_push(ticket, assets)
       end
       data[:assets] = assets
@@ -117,7 +118,7 @@ class Sessions::Backend::TicketOverviewList < Sessions::Backend::Base
       if !@client
         result = {
           event: 'ticket_overview_list',
-          data:  data,
+          data: data,
         }
         results.push result
       else
@@ -126,7 +127,7 @@ class Sessions::Backend::TicketOverviewList < Sessions::Backend::Base
         # send update to browser
         @client.send(
           event: 'ticket_overview_list',
-          data:  data,
+          data: data,
         )
       end
     end