undefined method `fetch' for an instance of String: nylas/handler/http_client.rb in throw_error

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Describe the bug
Nylas gem throws an exception NoMethodError on thread list request:
undefined method 'fetch' for an instance of String
The code:
provider_error = error_obj.fetch(:provider_error, nil)
nylas/handler/http_client.rb in throw_error at line 201

To Reproduce
It's hard to reproduce as we get the error in our Sentry log. The only information we have is the sentry log and that we make a GET request to get the threads list:
result, = nylas.threads.list(identifier: grant_id, query_params: attributes)

Expected behavior
The nylas gem throws NylasApiError

SDK Version:
nylas (6.1.1)