Shopify GraphQL API error

[tthau20101]

Hi, when i try to remove an line item from a checkout , using the graphQL API, it returns me the following error 

"Internal error. Looks like something went wrong on our end. Request ID: 9959051e-1376-4427-b3fe-7d13b4d465b3 (include this in support requests)"

Please assist. Thanks!