Error message

• Notice: Trying to access array offset on value of type null in _webform_client_form_rule_check() (line 2079 of /var/www/vhosts/hostalmaribel.es/httpdocs/sites/all/modules/webform/webform.module).
• Notice: Trying to access array offset on value of type null in _webform_client_form_rule_check() (line 2079 of /var/www/vhosts/hostalmaribel.es/httpdocs/sites/all/modules/webform/webform.module).