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Its from the custom espresso-events-table-template-toggle.template.php you have in wp-content/uploads/espresso/templates/
On line 88 you likely have $category_slugs = '';
$category_slugs = '';
If so, change that to $category_slugs = array();
$category_slugs = array();
We had the same report from another user using that same custom template so I’m assuming it’s the same problem as it’s the same error, if not we’ll need to see the contents of that template file.