diff --git a/src/python/matrix_client.py b/src/python/matrix_client.py
index 56813795..178c53db 100644
--- a/src/python/matrix_client.py
+++ b/src/python/matrix_client.py
@@ -301,7 +301,10 @@ class MatrixClient(nio.AsyncClient):
 
     async def onErrorResponse(self, resp: nio.ErrorResponse) -> None:
         # TODO: show something in the client
-        log.warning("%s - %s", resp, json.dumps(resp.__dict__, indent=4))
+        try:
+            log.warning("%s - %s", resp, json.dumps(resp.__dict__, indent=4))
+        except Exception:
+            log.warning(repr(resp))
 
 
     # Callbacks for nio events