### Version Information Server Version: v2.18.0 to v2.20.0-beta.1 ### Environment Any ### What is the current behaviour? <img width="623" alt="Screenshot 2023-02-27 at 2 17 39 PM" src="https://user-images.githubusercontent.com/20351766/221516312-309e8754-8e42-42cc-afb4-1368f5359569.png"> ### What is the expected behaviour? <img width="623" alt="Screenshot 2023-02-27 at 2 20 00 PM" src="https://user-images.githubusercontent.com/20351766/221516826-48f78990-7935-4cf1-a85a-fd2d18209840.png"> ### How to reproduce the issue? 1. Create a table like `CREATE TABLE person(id SERIAL PRIMARY KEY, name TEXT);` 2. Enter the following query in GraphiQL ```graphql query GetPeople($limit: Text = 10) { person(limit: $limit) { id name some_field_that_does_not_exist } } ``` ### Keywords error highlighting, graphiql