diff --git a/src/spikeinterface/widgets/metrics.py b/src/spikeinterface/widgets/metrics.py
index 2fbd0e31eb..813e7d7b63 100644
--- a/src/spikeinterface/widgets/metrics.py
+++ b/src/spikeinterface/widgets/metrics.py
@@ -235,6 +235,9 @@ def plot_sortingview(self, data_plot, **backend_kwargs):
             values = check_json(metrics.loc[unit_id].to_dict())
             values_skip_nans = {}
             for k, v in values.items():
+                # convert_dypes returns NaN as None or np.nan (for float)
+                if v is None:
+                    continue
                 if np.isnan(v):
                     continue
                 values_skip_nans[k] = v
diff --git a/src/spikeinterface/widgets/tests/test_widgets.py b/src/spikeinterface/widgets/tests/test_widgets.py
index debcd52085..80f58f5ad9 100644
--- a/src/spikeinterface/widgets/tests/test_widgets.py
+++ b/src/spikeinterface/widgets/tests/test_widgets.py
@@ -73,7 +73,7 @@ def setUpClass(cls):
             spike_amplitudes=dict(),
             unit_locations=dict(),
             spike_locations=dict(),
-            quality_metrics=dict(metric_names=["snr", "isi_violation", "num_spikes"]),
+            quality_metrics=dict(metric_names=["snr", "isi_violation", "num_spikes", "amplitude_cutoff"]),
             template_metrics=dict(),
             correlograms=dict(),
             template_similarity=dict(),