diff --git a/app/models/transaction/slack.rb b/app/models/transaction/slack.rb
index d187468b4..fc158d461 100644
--- a/app/models/transaction/slack.rb
+++ b/app/models/transaction/slack.rb
@@ -95,7 +95,7 @@ backend.perform
 
       # check if reminder_reached/escalation/escalation_warning is already sent today
       md5_webhook = Digest::MD5.hexdigest(local_config['webhook'])
-      cache_key = "slack::backend::#{@item[:type]}::#{md5_webhook}"
+      cache_key = "slack::backend::#{@item[:type]}::#{ticket.id}::#{md5_webhook}"
       if sent_value
         value = Cache.get(cache_key)
         if value == sent_value