diff --git a/grafana_client/client.py b/grafana_client/client.py
index e4717fe..9ce913b 100644
--- a/grafana_client/client.py
+++ b/grafana_client/client.py
@@ -142,7 +142,7 @@ def __request_runner(url, json=None, data=None, headers=None):
                     response = r.json()
                 except ValueError:
                     response = r.text
-                message = response["message"] if type(response) == dict and "message" in response else r.text
+                message = response["message"] if isinstance(response, dict) and "message" in response else r.text
 
                 if 500 <= r.status_code < 600:
                     raise GrafanaServerError(