diff --git a/google/cloud/aiplatform/metadata/experiment_run_resource.py b/google/cloud/aiplatform/metadata/experiment_run_resource.py
index ef4a08a504..87e0fb3eb5 100644
--- a/google/cloud/aiplatform/metadata/experiment_run_resource.py
+++ b/google/cloud/aiplatform/metadata/experiment_run_resource.py
@@ -1045,6 +1045,8 @@ def log_classification_metrics(
         if (fpr or tpr or threshold) and not (fpr and tpr and threshold):
             raise ValueError("fpr, tpr, and thresholds must be set together.")
 
+        confusion_matrix = confidence_metrics = None
+
         if labels and matrix:
             if len(matrix) != len(labels):
                 raise ValueError(