E_NOTICE when creating custom field of type select
- Create a custom field of type alphanumeric and drop-down select list.
- Doesn't matter what the options are.
- Click save.
Notice: Undefined index: serialize in CRM_Custom_Form_Field->postProcess() (line 848 of .../CRM/Custom/Form/Field.php).
If you have popups turned on you'll need to turn them off to see it, or look in drupal watchdog.
Seems to have been happening since at least 5.28.