Hi all,
since (at least) GLPI 9.4 an "Undefined index: default_value" appears in bulk update actions for text fields (without debug mode, the editable field does simply not appear)
The error appears in /inc/fields.class.php #681 in GLPI9.5 with Fields v. 1.11,
and in #670 in Fields v.1.12.
Solution: check for validity of the field by adding isset($field['default_value'])
/inc/fields.class.php #670 in Fields v.1.12:
if ($value === "" && isset($field['default_value']) && $field['default_value'] !== "") {
Thank you
Mirko