diff --git a/_unittests/ut_xrun_doc/test_documentation_examples.py b/_unittests/ut_xrun_doc/test_documentation_examples.py
index 6f6a5d1..9bf59e1 100644
--- a/_unittests/ut_xrun_doc/test_documentation_examples.py
+++ b/_unittests/ut_xrun_doc/test_documentation_examples.py
@@ -40,7 +40,7 @@ def run_test(self, fold: str, name: str, verbose=0) -> int:
             cmds = [sys.executable, "-u", os.path.join(fold, name)]
             p = subprocess.Popen(cmds, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             res = p.communicate()
-            out, err = res
+            _out, err = res
             st = err.decode("ascii", errors="ignore")
             if st and "Traceback" in st:
                 if '"dot" not found in path.' in st:
diff --git a/onnx_array_api/profiling.py b/onnx_array_api/profiling.py
index 3a346e1..fc9cee9 100644
--- a/onnx_array_api/profiling.py
+++ b/onnx_array_api/profiling.py
@@ -281,7 +281,12 @@ def align_text(text, size):
             return text[:h] + "..." + text[-h + 1 :]
 
         dicts = self.as_dict(filter_node=filter_node, sort_key=sort_key)
-        max_nc = max(max(_["nc1"] for _ in dicts), max(_["nc2"] for _ in dicts))
+        set1 = [_["nc1"] for _ in dicts]
+        set2 = [_["nc1"] for _ in dicts]
+        if set1 or set2:
+            max_nc = max([*set1, *set2])
+        else:
+            max_nc = 1
         dg = int(math.log(max_nc) / math.log(10) + 1.5)
         line_format = (
             "{indent}{fct} -- {nc1: %dd} {nc2: %dd} -- {tin:1.5f} {tall:1.5f}"
diff --git a/pyproject.toml b/pyproject.toml
index a465006..982ace4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,12 @@ select = [
 ]
 
 [tool.ruff.lint.per-file-ignores]
-"**" = ["B905", "C401", "C408", "C413", "PYI041", "RUF012", "RUF100", "RUF010", "SIM108", "SIM910", "SIM110", "SIM102", "SIM114", "SIM103", "UP015", "UP027", "UP031", "UP034", "UP032", "UP006", "UP035", "UP007", "UP038"]
+"**" = [
+    "B905", "C401", "C408", "C413", "PYI041",
+    "RUF012", "RUF100", "RUF010",
+    "SIM108", "SIM910", "SIM110", "SIM102", "SIM114", "SIM103",
+    "UP015", "UP027", "UP031", "UP034", "UP032", "UP006", "UP035", "UP007", "UP038", "UP045"
+]
 "**/plot*.py" = ["B018"]
 "_doc/examples/plot_first_example.py" = ["E402", "F811"]
 "_doc/examples/plot_onnxruntime.py" = ["E402", "F811"]