Getting e_wraning in preview mode when having an related entry with an members field about expressionengine

[shbchk]

Not sure if related, but I'm also getting this error in preview for an entry with related member field:

TypeError Caught
count(): Argument #1 ($value) must be of type Countable|array, string given
ee/ExpressionEngine/Addons/member/ft.member.php:433

[bryannielsen]

@DalizPR so the setup for this is editing an entry that has a relationship field to another entry which has a members field. Is the members field on the related entry empty? Also can you share a simplified version of the template that you're using for live preview?

[DalizPR]

The member field coming from the related entry is not empty.

{opdracht_project:contactpersoon}
{contactpersoon:voornaam} {contactpersoon:achternaam}
   {/opdracht_project:contactpersoon}

Where {opdracht_project} is the relationship field and {contactpersoon} is the member field.

[DalizPR]

Also when listing a number of entries with the same tags i get this warning.

Warning
Undefined array key "field_id_126"
ee/legacy/libraries/channel_entries_parser/components/Custom_field.php, line 109

[DalizPR]

An other thing, not a bug but concerning the same member field. In the entries overview is can show this field in the grid but i can't seem to sort this by clicking on the table head for this field. Its probably missing the class column-sort-header