diff --git a/flask_oauthlib/client.py b/flask_oauthlib/client.py
index 5a34d74e..1a6eefcc 100644
--- a/flask_oauthlib/client.py
+++ b/flask_oauthlib/client.py
@@ -536,7 +536,7 @@ def generate_request_token(self, callback=None):
                 type='token_generation_failed'
             )
         data = parse_response(resp, content)
-        if data is None:
+        if not data:
             raise OAuthException(
                 'Invalid token response from %s' % self.name,
                 type='token_generation_failed'