"Please select a rule first"

in the line

centreon-open-tickets/widgets/open-tickets/index.php

Line 52 in 355aea0

    
           $preferences['rule'] = (!empty($preferences['rule']) ? $preferences['rule'] : null);

the ternary return "1" if $preferences['rule'] isn't empty. If rule ID 1 doesn't exist, it says "Please select a rule first" even if you have one selected.