diff --git a/src/spikeinterface/sortingcomponents/clustering/merge.py b/src/spikeinterface/sortingcomponents/clustering/merge.py
index d35b562298..4c79383542 100644
--- a/src/spikeinterface/sortingcomponents/clustering/merge.py
+++ b/src/spikeinterface/sortingcomponents/clustering/merge.py
@@ -298,8 +298,8 @@ def find_merge_pairs(
     indices0, indices1 = np.nonzero(pair_mask)
 
     n_jobs = job_kwargs["n_jobs"]
-    mp_context = job_kwargs["mp_context"]
-    max_threads_per_process = job_kwargs["max_threads_per_process"]
+    mp_context = job_kwargs.get("mp_context", None)
+    max_threads_per_process = job_kwargs.get("max_threads_per_process", 1)
     progress_bar = job_kwargs["progress_bar"]
 
     Executor = get_poolexecutor(n_jobs)
diff --git a/src/spikeinterface/sortingcomponents/clustering/split.py b/src/spikeinterface/sortingcomponents/clustering/split.py
index a31e7d62fc..48ec26679e 100644
--- a/src/spikeinterface/sortingcomponents/clustering/split.py
+++ b/src/spikeinterface/sortingcomponents/clustering/split.py
@@ -61,7 +61,7 @@ def split_clusters(
     n_jobs = job_kwargs["n_jobs"]
     mp_context = job_kwargs.get("mp_context", None)
     progress_bar = job_kwargs["progress_bar"]
-    max_threads_per_process = job_kwargs["max_threads_per_process"]
+    max_threads_per_process = job_kwargs.get("max_threads_per_process", 1)
 
     original_labels = peak_labels
     peak_labels = peak_labels.copy()
diff --git a/src/spikeinterface/widgets/metrics.py b/src/spikeinterface/widgets/metrics.py
index c7b701c8b0..bc44e58a33 100644
--- a/src/spikeinterface/widgets/metrics.py
+++ b/src/spikeinterface/widgets/metrics.py
@@ -224,7 +224,7 @@ def plot_sortingview(self, data_plot, **backend_kwargs):
 
         metrics_sv = []
         for col in metric_names:
-            dtype = metrics.iloc[0][col].dtype
+            dtype = np.array(metrics.iloc[0][col]).dtype
             metric = vv.UnitMetricsGraphMetric(key=col, label=col, dtype=dtype.str)
             metrics_sv.append(metric)
 
diff --git a/src/spikeinterface/widgets/tests/test_widgets.py b/src/spikeinterface/widgets/tests/test_widgets.py
index 1a2fdf38d9..f60346ade0 100644
--- a/src/spikeinterface/widgets/tests/test_widgets.py
+++ b/src/spikeinterface/widgets/tests/test_widgets.py
@@ -376,9 +376,9 @@ def test_plot_rasters(self):
     # mytest.test_plot_unit_summary()
     # mytest.test_unit_locations()
     # mytest.test_quality_metrics()
-    # mytest.test_template_metrics()
+    mytest.test_template_metrics()
     # mytest.test_amplitudes()
-    mytest.test_plot_agreement_matrix()
+    # mytest.test_plot_agreement_matrix()
     # mytest.test_plot_confusion_matrix()
     # mytest.test_plot_probe_map()
     # mytest.test_plot_rasters()