Error on double backslashes

[RubenVanEldik]

I am trying to create a GraphQL query from string. The string contains some data with a double backslash in it (Modules\\Assets\\Entities) to connect with a specific morph relation on the back-end.

I expect the parser to just generate a GraphQL query from the string, like all other valid GraphQL strings. But unfortunately I get this error Syntax Error: Cannot parse the unexpected character "\\"..

I feel like it might have a very obvious solution, but I have no idea what and I can't find anything on the internet. Am I just overlooking something or is this a bug within graphql-tag?