It looks like you may have hit a bug in graphql-schema-linter.
It would be super helpful if you could report this here: https://github.com/cjoudrey/graphql-schema-linter/issues/new
TypeError: Cannot convert undefined or null to object
at Function.entries (<anonymous>)
at ignoreListErrorFilter (/home/lilleman/.../node_modules/graphql-schema-linter/lib/validator.js:143:39)
at validateSchemaDefinition (/home/lilleman/.../node_modules/graphql-schema-linter/lib/validator.js:72:68)
at run (/home/lilleman/.../node_modules/graphql-schema-linter/lib/runner.js:68:58)
I get the following error in my console: