diff --git a/monai/handlers/utils.py b/monai/handlers/utils.py
index 0cd31b89c2..481d5a1611 100644
--- a/monai/handlers/utils.py
+++ b/monai/handlers/utils.py
@@ -126,6 +126,7 @@ class    mean    median    max    5percentile 95percentile  notnans
             else:
                 class_labels = [str(i) for i in class_labels]  # ensure to have a list of str
 
+
             class_labels += ["mean"]
             v = np.concatenate([v, np.nanmean(v, axis=1, keepdims=True)], axis=1)