Uncaught TypeError: Cannot read property 'hasOwnProperty' of null

[ghost]

I have a filter with options as shown below which works perfect when browsing entries. However when I use this filter in a field with the fieldtype "entries" to select related articles it gives me the error as shown at the bottom of this issue.

Filter options:

{% for category in craft.categories.group('interests').all() %}
    {{ ({
        filter: {
            relatedTo: {
                element: category.id,
            }
        },
        label: category.title
    })|json_encode() }}{{ not loop.last ? ',' }}
{% endfor %}

Error code:

ElementFilters.js?v=1586255504:238 Uncaught TypeError: Cannot read property 'hasOwnProperty' of null
    at ElementFilters.js?v=1586255504:238
    at Array.forEach (<anonymous>)
    at updateCriteriaValue (ElementFilters.js?v=1586255504:235)
    at ElementFilters.js?v=1586255504:217
    at Array.forEach (<anonymous>)
    at updateCriteria (ElementFilters.js?v=1586255504:216)
    at HTMLDivElement.filterHandler (ElementFilters.js?v=1586255504:286)