PHP warning when member does not have page edit permissions

[sanderha]

I made a member group whom I wanted to be able to view the product catalog, but not edit the products. I therefore disabled the Content permission "Edit any page".

When this permission is switched off, a PHP warning is thrown:
[Warning] Missing argument 2 for Milkyway\SS\Shop\Inventory\Extensions\ProductCatalogAdmin::Milkyway\SS\Shop\Inventory\Extensions{closure}(), called in /Applications/MAMP/htdocs/restaurant-flammen/framework/forms/gridfield/GridFieldDataColumns.php on line 143 ...

It then refers to line 26 in ProductCatalogAdmin:

'callback' => function ($record, $col, $grid) {

For this project it was okay to just enable this permission again to avoid the warning, but I thought I'd just let you know.