diff --git a/nemo/collections/asr/parts/utils/vad_utils.py b/nemo/collections/asr/parts/utils/vad_utils.py
index 44f2abec584f..fb511aacd816 100644
--- a/nemo/collections/asr/parts/utils/vad_utils.py
+++ b/nemo/collections/asr/parts/utils/vad_utils.py
@@ -1051,11 +1051,11 @@ def plot(
     else:
         label = None
 
-    if label:
+    if label is not None:
         ax2.plot(np.arange(len_pred) * unit_frame_len, label, 'r', label='label')
-    if pred_snippet:
+    if pred_snippet is not None:
         ax2.plot(np.arange(len_pred) * unit_frame_len, pred_snippet, 'b', label='pred')
-    if frame_snippet:
+    if frame_snippet is not None:
         ax2.plot(np.arange(len_pred) * unit_frame_len, frame_snippet, 'g--', label='speech prob')
 
     ax2.tick_params(axis='y', labelcolor='r')