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-rw-r--r--google/api_core/grpc_helpers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/google/api_core/grpc_helpers.py b/google/api_core/grpc_helpers.py
index dfc8442..0ccbe12 100644
--- a/google/api_core/grpc_helpers.py
+++ b/google/api_core/grpc_helpers.py
@@ -216,7 +216,7 @@ def _create_composite_credentials(
else:
credentials, _ = google.auth.default(scopes=scopes)
- if quota_project_id:
+ if quota_project_id and isinstance(credentials, google.auth.credentials.CredentialsWithQuotaProject):
credentials = credentials.with_quota_project(quota_project_id)
request = google.auth.transport.requests.Request()