PHP errors

Hi,
my query monitors shows 2 PHP-errors, I wonder if I should worry about them, they don’t seem to be really urgent as they’re just notices, not warnings.

Notice:
Undefined index: pid_permalink_enable
Location:
wp-content/plugins/pdb-permalinks/pdb_permalinks/Plugin.php:55
component:
Plugin: pdb-permalinks

Call Stack

pdb_permalinks\Plugin->__construct()
wp-content/plugins/pdb-permalinks/pdb-permalinks.php:24
pdb_permalinks_initialize()
wp-content/plugins/pdb-permalinks/pdb-permalinks.php:15

Notice:
Undefined offset: 1
Location:

wp-content/plugins/participants-database/classes/PDb_Update.class.php:61	
component: Plugin: participants-database

Call Stack

PDb_Update->__construct()
wp-content/plugins/participants-database/classes/PDb_Aux_Plugin.class.php:223
PDb_Aux_Plugin->initialize_updater()
location unknown
do_action('init')
wp-settings.php:449