Issue #3393662: TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in array_keys() (line 258 of /code/modules/contrib/better_exposed_filters/src/Plugin/better_exposed_filters/filter/FilterWidgetBase.php).
requested to merge issue/better_exposed_filters-3393662:3393662-typeerror-arraykeys-argument into 6.0.x