Non-error reported as an warning

In Query Workbench, my query ran without error, yet it shows an error message for an array that output properly.

select meta().id,email,city,phone,`travel-sample`.reviews[0].ratings
from `travel-sample` where type="hotel" limit 5;

[
{
"city": "Medway",
"email": null,
"id": "hotel_10025",
"phone": "+44 870 770 5964",
"ratings": {
"Cleanliness": 5,
"Location": 4,
"Overall": 4,
"Rooms": 3,
"Service": 5,
"Value": 4
}
},