[Grid] AdvancedColumnCollector exception

[Corepex]

Hi Team,

If you open the data-object folder with the ID 695 you get several endpoint errors.

See:
http://localhost/pimcore-studio/api/data-object/grid/available-columns?classId=EF_FD&folderId=695
http://localhost/pimcore-studio/api/data-object/grid/configuration/695/EF_FD

I added the following lines to check if that already fixes the issue:

if($classDefinition !== null) {
    $classIds[] = $classDefinition->getId();
}

That brings then the following error:

Best guess would be that back in the days Category was named ProductCategory and this name is still in there.
Please have a look and check why that occures and how to prevent it.

[Corepex]

Searched a bit more and found out that the crossSellingCategory is the issue.
Just select Category in the Allowed classes and save the definition - then everything works again.