diff --git a/src/galaxy/api/jsonrpc.py b/src/galaxy/api/jsonrpc.py
index be78969..51ecad3 100644
--- a/src/galaxy/api/jsonrpc.py
+++ b/src/galaxy/api/jsonrpc.py
@@ -360,7 +360,8 @@ class Connection():
 
     @staticmethod
     def _log_error(response, error, sensitive_params):
-        data = anonymise_sensitive_params(error.data, sensitive_params)
+        params = error.data if error.data is not None else {}
+        data = anonymise_sensitive_params(params, sensitive_params)
         logger.info("Handling error: id=%s, code=%s, description=%s, data=%s",
             response.id, error.code, error.message, data
         )
diff --git a/tests/test_refresh_credentials.py b/tests/test_refresh_credentials.py
index 4b5f7c1..1bb3678 100644
--- a/tests/test_refresh_credentials.py
+++ b/tests/test_refresh_credentials.py
@@ -4,7 +4,7 @@ import asyncio
 from galaxy.unittest.mock import async_return_value
 from tests import create_message, get_messages
 from galaxy.api.errors import (
-    BackendNotAvailable, BackendTimeout, BackendError, InvalidCredentials, NetworkError, AccessDenied
+    BackendNotAvailable, BackendTimeout, BackendError, InvalidCredentials, NetworkError, AccessDenied, UnknownError
 )
 from galaxy.api.jsonrpc import JsonRpcError
 @pytest.mark.asyncio
@@ -40,7 +40,7 @@ async def test_refresh_credentials_success(plugin, read, write):
 
 @pytest.mark.asyncio
 @pytest.mark.parametrize("exception", [
-    BackendNotAvailable, BackendTimeout, BackendError, InvalidCredentials, NetworkError, AccessDenied
+    BackendNotAvailable, BackendTimeout, BackendError, InvalidCredentials, NetworkError, AccessDenied, UnknownError
 ])
 async def test_refresh_credentials_failure(exception, plugin, read, write):