Incompatibility bug with field permissions module when there are custom perms on the countdown timer field of entity

How to reproduce this bug.

- Create countdown timer field for one of your content types
- Install the Field permissions module and enable it (https://www.drupal.org/project/field_permissions)
- go to manage fields of your content type
- Edit the countdown timer field
- Select custom permissions for that field, and uncheck the "Create own value for field [field_your_field]" for authenticated users. I needed that in order to let only administrators create values for that field.

With this settings the field will be hidden for authenticated users while creating the node. after creating the node an error appears. For see the error please check the attached image.